A couple months ago I paid for some relays but since then I've let the subscription lapse. I see this in my DMs since some of these send a sort of receipt or "intro to our relay" type message but given that I connected with these months ago, it'd be helpful to have better context on the situation. Props to Nostr.wine for putting quite a bit of information in DM.
I suppose some of this will be figured out as a unified interface in the client, with near automatic payment to keep up some of these relays. I guess for now I just want to tell those who are running paid relays to help users out by sending a receipt showing date, period for which payment was, sats paid, then a summary of how much data was sent/recieved. I'm not sure the relays software supports all this but more clarity is good.
The end result of my experiment was that paying for relays wasn't worth it except as a donation to help support costs. I didn't see any benefits in particular and perhaps this is another thing that clients can help with. A little star on a note that you only got through a single paid relay.
I'm going to go through and renew these to support the concept but I'm looking forward to there being more clarity and tangible benefits going forward.