New pin prices are up, so the cost of "used" games goes up as well. Most 90's titles can be had for less than the price of a NIB Stern pro, let alone the LEs. I don't buy into this "bubble" that will "pop" someday soon.
Buy what you like, enjoy it and maintain it while you have it, sell it if you tire of it. If you make a few bucks or lose a few bucks, it won't matter much if you bought it because YOU liked it and enjoyed having it at your disposal.