Same here mostly a collector, NES specifically.
I have over 300 carts for the NES. Some highlights
All three Ultima's Complete in Box (CIB)
Final Fantasy CIB
2 NES action Sets with different Boxes (CIB)
1 NES Toploader
1 NES Control Deck Test Cart
1 Supervision 110 in One Cart (Pirate)
Bubble Bobble 2
Chiller (2 player zapper title can use 2 zappers)
NES 4 score CIB
All 6 Megaman titles
Dragon Warrior 1,2 & 4
L'emperereur CIB
All 3 Ninja Gaidens
All 3 Castlevainias
All 3 Mario Bros (technically 4)
Those are less than a quarter of the games that are worth more than 20 bucks.
All told my collection would probably sell for 3k-5k on ebay easily.
EDIT: To answert the OP: Yes I consistantly buy games just to collect them. Even more recently I have become extremely anal about the games I buy this gen. I stopped buying used because they tend to be missing things (manuals cases) or have stickers attached to the paper inserts which are too much of a pain to remove.. I always keep the box to the system or game (I made my brother keep his Rockband box in my closet rather than toss it.) I try not to trade or resell unless the game absolutely sucks and I could buy it later at a rediculous bargin.
