[dudeinjapan]

This is actually a great solution to the problem.

[throwaway426079]

From your username I figure you might know: are any other services sold this way in Japan?

I ask because if not then it's going to be difficult to go first. If yes, any idea how it influences behaviour?

[dudeinjapan]

Apartments come to mind. In my business we also help restaurants take deposits for reservations, which is now becoming the market standard.