I have years of experience with drones and have interest in buying an fpv drone but I don’t really know what the purpose of one is?
I see videos of people flying them in and out of abandoned buildings but I haven’t got all that around.
Other than that what else could they be used for?
I just got an Avata 2 after having the mini 4 pro. It’s just so different type of flying and using the goggles is a much better experience. I’m a total newbie but the remote is very easy cop-on and I’m enjoying it.
@stuatterson Welcome to the Drone Hub community 
When flying your Avata 2 using the FPV Goggles you must remember to have someone with you at all times as your spotter a observing person maintaining VLOS at all times 
First Person View (FPV) | UK Civil Aviation Authority.
@Kieranlandy Welcome to Drone Hub
Welcome @Kieranlandy to the Hub!
Yes.
I have not flown my DJI mini since I built my first quad
The purpose is fun. Flying FPV, especially in manual mode, is a heck of a lot of fun and insanely rewarding.
I picked up a used DJI FPV that I randomly came across in CEX back in November. Spent a lot of time in the sim learning the basics, then crashed the FPV, lost it, found it, bought another one, lost that (in a canal), fixed the first one, crashed it and broke it again, and switched to self-built 5" quads instead (the DJI drones aren’t durable enough for manual mode FPV - at least not with me at the controls 
- and repairing them is a pain because of part availability)
Fast forward a few months and I have three 5" quads and two tiny whoops, and I’m out flying every chance I get. It’s a bit of an addiction tbh, but I love it. I freestyle most of the time, but I’m starting to get into racing (mostly in the sim for now) as my fine control improves, and I’m having fun with that too.
Downsides? Well, manual mode is hard to begin with (which is why it’s so rewarding), and you’ll crash and break things. In my opinion, if you’re flying manual and not crashing, you’re not improving - so it’s par for the course. As your skills improve you’ll crash less. The trick is to keep your serious crashes confined to the simulator but even with a lot of sim time you’ll still crash when you get a quad in the air for real, because sims aren’t perfect. But by the time you fly for real hopefully the silly crashes we all have early on will have been had in the digital world already.
For me, it does help that I have a background in computers / electronics so I can do my own repairs, but that’s not strictly necessary and you can either learn as you go or find a flying buddy to help you.
If you want to dip your toe in, I’d suggest getting a used controller (something cheap like a Radiiomaster Pocket) and trying out the sim, there’s a few options available (my personal rec would be Liftoff). If you like that, grab a cheap set of analog goggles and a tiny whoop, your opportunities for flying are much more open with them. After that you’ll figure out what your next move is based on your own experience 
Here’s a vid of me testing out a new tiny whoop a few weeks ago, with these small drones the world really is your playground, even if you don’t have any epic bandos nearby I take it pretty steady to begin with (getting used to the new drone) but start chucking it about a bit more later on - the nice thing about tiny whoops (other than their size) is that they really can take a crash and just crash flip and get back up there 
Agree with everything almost by @rossbamford-j8rwq
Just going to add dont get a 65 whoop go 75 or 80 85 as thease are a little less jumpy and a little easyer to control as long as 1s.
Yes its about the fun fixing flying fixing and fun.
There us a lot to navigate, and it can be difficult just to find ok spots to fly yet with the tiny woops should be ok.
Jellup
Good shout @Jellup , Something like an Air 75 or a Meteor 75 would be a great starter @Kieranlandy . They are a bit more stable (especially outdoors) and get better flight times because they take the bigger 1S batteries (550/600mAh vs 400 max I think in my 65’s). The Air 65 II Champion edition I’m flying in that video is a bit of a special case because it puts out insane power so is actually pretty good outdoors, but the battery life is, well, let’s just say you need a lot of batteries and charging in the field to get much practice time with them
I wondered the same for a long time. I now liken it to taking the family car to Tesco, for the shopping. Vs mucking about on a dirt bike in a field.
Lots of fun, but maybe not a lot to ‘show’ for it, eg you can also take the scrambler to the shop and pick up some milk. Lol, I sound insane, but the shopping part of the analogy is the photo and video!
Buy and enjoy without getting bogged down in ‘videos and photos and specs’
Even cheaper way to dip your toe into FPV sim flying:
It’s just for FPV sims, it’s not a radio but for £13 you can leave it plugged into your pc and practice.
You can get them on ebay too but a little price gouging goes on and they’re twice as much !
Saw this the other day