You could also go the AstroMart route and charge a one time fee (U$12 for AM).
This would hinder people who are here as "time wasters" to quote Chris...
Either way is cool for me, but I suspect that people trying to get into Astronomy may see the dollars as a hindrance. Also, what about the international community, albeit modest. Transferring money internationally is usually costly for small sums, as there is a minimum transfer fee.
OIC!
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