Honestly I found pretty good TRADES here. And the good deals they get sold really fast, for some parts and accessories I found the forum a good source.
But yes most of the people who have spent 300-500 in upgrades or customization pretend to have that back, there is sellers who put a detailed list of what they spent showing what the `real`value of the gun is. And most of the time the final price is absurd.
The retailer section is something else, I had the chance to buy in this forum something that here in Canada is almost impossible to get from the people of Illusion... Just get AV and take your time, if you rush you r going to do a mistake. Ask, read, research, and then SPEND