I don't think there's any excuse for releasing error-riddled ebooks; if you don't know how to format them properly, hire someone who does. I'd like my books to be generally available in formats that my customers want, and I expect them to be competently presented so they don't make me look sloppy.
I'm not keen on the subscription model, though. That's not just in one field, it's an increasing trend throughout society. Television, for instance, used to have free broadcasting and has now mostly gone to paid services. Result? We have a TV set that we use only to watch recorded material. Subscriptions are an ongoing drain on household budgets and they add up fast. I think that for most purposes it's better to pay once and not have that constant drag.