I completely get people selling games because they don't like them, need room, need their $$ out, or any personal reason.
There are definitely flippers however, that:
a) buy a game knowing its leaving before they have it (new or otherwise)
b) attempt to fix a game they bought for dirt, then flip stating "minor issues"
c) selling "vaporware" for profit (spots in line for games or high end mods)
d) selling a game as something it's not
Not a fan, but am sure several make decent $$$ at it, even funding their collection and gaining stature in the community as a "great seller" in the process.
Doubt they care what anyone thinks about it. I would fall into the "I don't like it, but don't care as they don't" category, but not an option in the poll...