I don't know how you can't comprehend that it takes time to make something good.
6 months between updates is a problem for you, because you're impatient.
It's not like the developer is doing nothing all day long, he's working long hours on this project.
Most games on this site are shit. Then there are some gems among the rough. Then there's this game, putting almost all of them to shame.
When DPC finished Acting Lessons, he was a huge name in this industry. Then he started BaDIK and his popularity grew even more. Once he's finished this game and starts another one, he'll only be raking in more millions.
Given his selection in music, his style in story telling, his animation and graphical skills, and his humour to boot, he can just start another game in another genre and he will be successful.
He doesn't have to "milk" this game to make money, and if people start losing interest in this game because he is milking it, he'll only lose money in the long run.
Compare that to Dark Cookie and his Summertime Saga. That was a great little game, but it's totally being milked now, the updates are pathetic and the game should just be ended, but he's making 75K a month, so he's opted to milk it instead. That is 100% not what DPC is doing.