I started yesterday with the paid relay so we will see. I’ve run a smaller public one for a while and it is already getting slow and I don’t want to upgrade it.
I think (if we succeed) everyone is getting a massive earlier adopter discount right now. Just thinking about it logically $1-3 per user lifetime is too low if they maintain a reasonable amount of activity.
Either the one time fee would have to go up drastically (10x?) or maybe annual/monthly subscription. Some friction with that and the push only nature of lightning though, less payments might be better.
Different relays will come up with different strategies as they grow. I do think the early paid relays today (even tiny fees) will feel compelled to stick around for their users.