Indeed it isn't ideal, but here it's a decision of whether to go for ideology here versus accuracy. While I understand it's a Bitcoin forum, if they aren't paying in Bitcoin...
If you really want to, it might be worth making a separate table for signature campaigns which pay out based on USD if more of them come out.
I rather have one thread to rule them all and accuracy, so if needed, I'll let go of my ideology and just add dollars to the table.
while i do support your sentiment on having strictly bitcoin prices listed on there, fact remains that this table is a helpful resource for others. instead of having a possibly confusing ** listed in the table, it would be much more helpful to have the USD values listed, and maybe have a note below in the description section that the payouts will be converted to bitcoin based on the price at time of payout.
or, this price fluctuation may come to pass within a week and they might have new stable rates, and this discussion might be pointless. who knows.