Best reason for the supporters to pay the developer per update and not monthly.I really think that when some game gains enough supporters, the goal of the devs and the patrons actually become opposite. Patrons want the great game continuation and devs want the chicken to lay the golden eggs as long as possible, i.e. they have zero motivation to quickly deliver. This is why there is so few finished great games.
Is the developer delivering the goods? Yes! Brilliant, here's some money for your work, thank you; No update? Too bad, no cash for you...