Yeah I have two, my wife has one, and my son technically has three. But of my son's, two need to be given away/find new homes because they're not the right size.

I think two is great number for me. If I did ride *more* technical stuff, I'd get another 29er but I did pick one up not too long ago, and every time I was on it, I wished I was on a cross bike, so I gave someone a really good deal on it through craigslist.