Ha, I can't really say at the moment unfortunately
other than for this year we've made some deals with publishers and studio's to launch the art collection around the same time as the titles are released. Plus that we've made an effort together to create concept work and specially created pieces specifically for the art market (which means they need to make art at crazy high resolutions).
The Stahl Arms piece from Killzone was one of the first to have been created specifically for print for example. At 110 cm's wide, it's a large piece. Both the Guerrilla directors/founders bought one themselves, they liked it so much
Our focus is mostly on independent game artists and/or autonomous work but every year we'll do at least 5 big studio/game projects. Killzone for this year is our first. Late last year (when we launched) we did our first with Vanguard Games (of Greed Corps and Gatling Gears).
Also, buried to much in the site's ToU but we provide a 30-day return policy for buyers.