Looks like a nice and straight forward service but I am not completely sold on the pricing. I get the idea, but in my opinion most websites will choose a theme

Looks like a nice and straight forward service but I am not completely sold on the pricing. I get the idea, but in my opinion most websites will choose a theme and try to stick to it. Even changing it every year might be much for most, so why would I pay a subscription? Wouldn't a flat amount, even if higher, be more reasonable?