Wait - you can SELL guitars after you buy them? Seriously???
What's too many? Only when you say it's too many. I have more than I need, but not more than I use. I really have no overlap - I have some that are somewhat similar sounding, but no duplicates. My focus has been more on having something that will grab a different tone than what I currently have. I had to make a second hour-long drive when I bought my AV because I wanted to make sure I wasn't tricking myself into thinking that it sounded different from everything else.
Are there some that get played more than others? Absolutely - my 408 is my current #1, and my DGT, AV and Petrucci get the bulk of the general playing time after that. Other than times when I'm using a specific guitar for something in particular (like the current recording I'm doing w/the 7-string).
Will I buy more? Oh yeah....