[ujal]

I disagree here. If growth is the main factor for a startup, charging one-off fees guarantees you not to be delusional about your growth. It is actually much easier to get stuck with the recurring fee model, where you reach ramen profitability but don't grow as fast or worth - not at all.

EDIT: Actually the same psychological effects that push entrepreneurs to charge a recurring fee, push the customers to prefer a one-off fee.