How many games do you need to be interested in before you buy their console?

Usually 3 is the magic number. Three really appealing titles. I have bought consoles (handhelds, specifically) for just one game twice now and felt burned in the end both times.

Favorite console is probably PS2 or PS1. Tough to choose.

Current gen: I have none unless Wii U still counts. Plan to get PS4 eventually.