^ This guy feels me about action figures. Hi-5 on that, downlowtooslow.
Poseable figurines are effectively toys. What do you do with toys? You play with them.....
Aren't you a little old to be playing with action figures now? But before that, there's only so much you can do with action figures until you get bored or grow out of it.
I don't know about other people, but I don't play with my Figmas and other poseable figures. They get displayed exactly the way a normal fixed figure does, it's just that you have more initial options in how you'd like them to be posed and the option to change that pose later. Aside from the occasional dusting, I touch mine about once a year.
Aside from that, I buy Figmas simply because they're nicely made, well-sculpted figures of characters I like, and sometimes they're the only figures of those characters. I'll buy just about anything of a character I'm a fan of if I like the way it looks, which is how I've ended up with the Beatrice and Saber/EXTRA Dollfie Dreams.
As for Nendo/Figma pricing, what I've discovered is amazing is Mandarake. If you guys don't know about them, they're a chain of anime collectible consignment stores in Japan. Basically, fans can rent space in a display case there, and put their stuff up for sale there. What's cool about Mandarake is that they list everything online, and will ship to the US. When I bought the Kuroneko Figma and Nendo, they were Y2500 and Y2000 respectively. The Nendo was brand new in a sealed box, the Figma wasn't sealed but it was otherwise untouched, the figure had clearly never even been taken out of the box. They both were listed as "minor box damage", but the damage on both was so minor that I had to search for several minutes before I found it, and it turned out to be a tiny tiny bit of finish rubbed off one of the corners on each. You can get deals that are even better if you'll settle for one with serious box damage, like a crushed corner or something.