I,oddly enough, had the opposite. Gave my software out to a few friends (wrote it for myself, as the others in its class sucked), Next thing I know I'm getting 100k d/l a month (paying for overages, fun) - and soon after have a few million users. Never have spent any money on advertising (even though the software DID make it on to a TV show in Denmark a few years later - and magazines, newspapers, etc.) Still getting downloads and new users.

Have also written tons of other stuff that this did NOT happen to :)