Anecdote: I'm a Shinobi fan, so I wanted to get a genuine copy of PCE Shinobi. I "set" my price at $40 for cic, but most offered on ebay were $60+shipping or more, including a sealed copy for $80 from dr. orangejuicer.
I waited (as in a couple months), and finally got it for $35+shipping from Japan.
If you're an actual collector, the hunt is supposed to be part of the fun, which includes patience and networking.
This, this, so much this.
I've paid right around 20$ or less for most of my PC Engine games (shooters, action games, not crap usually) , and the BIN prices are frequently $40+ for the same titles. I just wont pay that, they're not worth that to me. So I wait, and get to "hunt" which yeah, is actually just stalking ebay hard with buyer alerts etc. But it's super satisfying when you get your game at your price, and it adds in that delayed gratification that actually makes you look forward to playing the thing when it arrives your mailbox. What fun would just be buying everything on a larf? None to me (though I guess I'd like to have that kind of money....)
On the flip side, I've also struck while the iron was hot and maybe overdid it, but felt it was worth it because the price was good. If anyone here was the guy on ebay selling awesome PCE shooters in TZD cases with no labels, for 20$ BINs right after Xmas last year, I'm the guy who bought a shit ton of them. I couldn't resist, and I'm still playing through them.