NUON collectors are few so it is hard to gauge what the value of the items are. Those are two pretty rare games so they will probably be some of the most valuable titles but the best way to check is try to lookup the history of those titles on eBay to see what they have been going for.
Like I said, those titles are ultra rare. They are not seen very much. The NUON base is small, tiny to be exact so you just don't know what the real value of something is until you put it out on eBay.
i really would like to have those games, iron soldier is probably out of reach for me forever, tetris maybe some day, if someone would just run an auction instead of an insane buy it now. no way i am paying 800
Ghan has said he has fixed this. Monovertex please confirm this fix. This was only a problem with people that had signatures in the upper levels like not the special members but the respected members.