As with all games if you like it, then great, if you don't there are plenty of others out there. I think the game will get better with some more code refinements especially if the pop a creature is used less (like once you qualify one it won't pop back up) and there's more reason to do the book modes for points.
Bottom line, if you enjoy a game, keep it and enjoy it. I don't think the actual resell price is that much of a reflection on how people feel about the game. Rather I think it is a reflection of how many NIB options are out there and when you buy one of the most expensive NIB pins you just aren't going to get all of that money back out of it. NIB pins are becoming more like cars, they depreciate the moment you take delivery of them whether you open the box or not. I doubt any of my recent NIB purchases will sell for more than 80% of what they cost me. That means you're losing substantial money on a $9500 pin. I'm on the list to get a pirates so obviously I think it's worth having this over priced toy in my house for a few years even if I lose money when I actually sell it.
Just an FYI, it seems like those that absolutely hate GB are the same ones that love Hobbit, and quite a bit of the reverse too. I considered selling GB and buying a friends Hobbit. I don't think GB is the best game in my collection (and maybe not the worse, RZ is still getting better code), however, no one in my family thought Hobbit would be a step up or even wanted it in the house. They are two totally different games designed for completely different people. GB will make you a better player (and has in our house), and you feel like a god (small g) when you get through the modes and have a stellar game. I'm not sure if Hobbit will make you a better player and even some absolutely stellar games we've had on it (a friend owns one, and the local arcades have them) don't make me want to play it again and definitely not on a weekly or daily basis.