Martin:
Are you okay with people announcing things they've listed on one of the other selling services?
I realize that wouldn't work for those who want to limit their market to ETS'ers, but it's a possible workaround for others.
As to only allowing people who've given some support to ETS to sell, if a donation is required to do something, it's no longer a donation. Could that potentially get ETS in trouble?
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Okey-dokey. What's plan B?