another thing thats is raising prices is the fact that almost everyone collects nowadays. I remember years back when collecting toys was uncommon and was mainly the younger crowd that grew up in the 80's and 90's (not entirely, but the majority). When going to toy shows or collectable expos you see and wide variety of people collecting, many that just are jumping on the bandwagon. When you get people blindly collecting, they usually dont study up on what things go for and usually buy at the prices listed.
And with more sellers, once they get a price for something, they almost always keep asking that price. Even if there is no one paying, and once people see prices listed at a certain price it give more people the incentive to try to sell their items at that price.
Sadly, I think there will always be a sucker willing to pay a listed price, and like Plastichorror said above An informed buyer i less likely to be gauged.
Instead of having a group of people posting in peoples threads (that will likely cause conflict and arguments), we should have a thread for asking what items can be worth or should go for.. Maybe have a list of members in the first post that can be contacted about specific toy lines (Muscles, MIMP, Battle Beasts, Keshi lines, etc...
I think people should be able to ask whatever they want and not be harassed. But give the buyers an option to learn on the price first, if they are willing to pay for it or not.
Maybe make it that anyone selling HAS to link to that thread, that why if people dont know about it they can learn its there as an option.