My normal response is there is no such thing.
But recently, there is this guy who has been posting on facebook all of the stuff he has been buying on ebay (allegedly for steal prices) and every so often he will post pictures of certain things in his collection. Like how he owns 3 Misadventures of Tron Bonne and 12 copies of Symphony of the Night... for no reason. When asked why he does it, his response is that he can't turn away these awesome deals he gets for the games.
When you own multiple copies of a single game for absolutely no reason, that's too many games.
I disagree.
I wouldn't mind having multiple copies of symphony of the night when the price is a steal. Tron bonne is one of the more expensive titles in the US but also in Pal land and It's a megaman spinoff . These aren't your ordinary games they are worthy to have multiple copies of.
I personally think someone is a bit jealous
Anyways back on topic in my opinion you can never have to many games.
Everyone has different reasons for collecting, certain people go for full sets while other collect only the better titles or there is that group of people who only buy a select few games.
If one has multiple copies of many many bad games without any nostalgia or any reason at all than one might have to many games but one can;t judge a book by It's cover.