If nothing else, they should persist until a current Nitro sub with your exact name wants your exact number. I feel like having subscribed to Nitro for any length of time is enough to allow users to have a (semi-)permanent custom tag, as $10 would be way overpriced for a custom tag purchase by itself.
Or, it would also be nice to sell custom tag changes for like $1 or something. I'd buy it.
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