Why finish a game that makes you money when it's in development?
There are technically finished games, yet they are being updated, I cant comment on how much they make, but surely lots judging by the effort being put into them.
Think Portals Of Pheremon for example, the writer could drop the game at any point, I would follow him to donate on his next project, because as far as pheremon goes, he/she delivered many many updates ago, the game can be tagged complete at any time with no complaints on my side.
Other writers of-course have different approaches, take the writer of good girls gone bad, loved by many.
This one for example, can have the main story complete, and can still have major overhauls through adding new planets, and the never ending stream of characters, or even complete one ending, work on alternate endings, possibilities are endless with so many characters. The you can work on how the game treats you depending on different endings, seriously the game can go on for years like that.
My concern is this game is a predecessor to COC, which is brilliant, but a sister to Fall Of Eden which is concerning...