I can host up to 300 domains on my reseller account, but I'm getting a bit close to the limit now - only 275 left to go!
formatting link
5 years ago I seriously considered getting my own server on the Internet but those mad thoughts have long since left. Stuffing all your eggs in one basket means that if the basket springs a leak then you've got eggs all over the floor whilst you go out and get a new basket.
PoP