ARs are like most other mass production guns- if you turn right around and sell it, you WILL take a loss if you paid for a NIB gun. There's a ton on the market, and while they're popular, right now production can more than supply the demand. That might change come the election (last time, everything AR was super-popular for a year or so and nobody could keep up with the market).
I'm not so sure that companies like PSA are depressing the market- they don't have enough of a production capacity to pull that off and the folks rolling their own are not the same folks buying whole rifles. They have an extremely vocal group of supporters, but even those supporters have to admit that PSA can't keep up with demand. They just aren't big enough to make the average buyer think "$900 for that Stag is a bit much when I can call up PSA and wait a month or two and hope the rifle is what I ordered... I'll save a couple hundred bucks." Just not happening. Sorry.
If you want to try one out, you might want to find one you can borrow or rent; that should clue you in as to whether you'll like it or not, at least initially.