Smugmug had 200,000 paying users last I heard. It's not a public company, so not obligated to unlimited growth. If they're making money and having fun with their current customer base, there's no need to target everybody else.
They can simply add features either as they become important to their current customers, or as they feel like it would be fun to do (e.g. OpenID). They'll grow organically just fine and still leave plenty of room for everybody else. There are millions of people out there who should share photos online but don't.
They can simply add features either as they become important to their current customers, or as they feel like it would be fun to do (e.g. OpenID). They'll grow organically just fine and still leave plenty of room for everybody else. There are millions of people out there who should share photos online but don't.