Add new features, and you can slap a new release number on it, and charge money to upgrade to it.
Fix bugs, and people expect to get that for free. (Because they expect the bugs shouldn't have been there in the first place, which is right.)
So businesses figure adding features is a profit center, while fixing bugs is a cost center.
And there's no way, it seems, to punish companies by not buying their software if it has (too many) bugs.