I started about 3 years ago with the help of a friend. I think I've bought at least 8 used bows since then and sold all but 3. If you buy right, you can sell for as much as you paid for them. Other times more or a little less. Out of all those 8 bows, I might be down $200. And if I wasn't as compulsive as I am, I'm sure I could have come out ahead because there's lots of compulsive buyers out there. Selling them isn't quite as fun, but there are plenty of buyers here, other forums, and on several FB pages. I still have the 2nd or 3rd bow I bought, a black widow PFT. It's my fav and I even bought a lighter PFT since then because my shoulder was giving me trouble with the higher poundage of the first.
It's not necessary, but if you can afford to be out of the cash for a bit, buying a variety of bows to try out is kind of fun. I started out shooing a couple lighter poundage recurves including a Bear Grizzly, which has a medium high grip, and a Kohanna Kurve with a 50's style sort of grip., completely different. I'd shoot one for a few weeks and then another for few and then go back. If you have your form down pretty good, it doesn't take too long to get fairly accurate. Lessons from a reputable instructor would be ideal to avoid developing bad habits, which can be very difficult to break.