64k.us I just registered this today. Could it have any value to the right buyer if I held onto it? It has been registered before.
If I had to guess, I would say reg fee. Maybe someone might like it because it has meaning. But from what I've seen the only extension where a mix of numbers and letters usually sells well is .com. Plus, the fact that you can registered it means that it probably wasn't all that sought after. If names like it constantly sold for $xxx, someone would have backordered it when it dropped.