People complained that a lot of new games coming out were all using the same few successful layouts with small changes. Avengers is completely different than anything else to come out and now people complain about that.
Avengers is the hardest game I own and IMO the hulk version is one of the best looking cabs out there and I think it deserves more attention than it gets. Great for med to large collections. For what they have been going for they are one of the best deals on the market. Playing this game will make you a better player as a lot of shots are very tight and very hard to complete the avengers on the default settings minus the hulk. Game would really benefit from a software update. There's a lot of cool modes in the game but most people will never see them without adjusting the settings.
With that being said I think tron acdc Metallica and Star Trek are all better games and that has hurt the value. If I did have to get rid of a pin it would prob be avengers. Although if I had to sell it 1500-2k less than what I have in it I would prob keep it or trade it. They only made 250 of each version so I think eventually the price will even out after most of the nib floating around are in private collections. The release of avengers 2 could help increase demand as well.
Might take a little while to sell but I think 6k with all those mods is a good price and eventually someone will grab.