I noticed that Morgan Ironfist suggested on the Siege forum that people hold off until shortly before a trade deal expires after a week before they make their next donation, to avoid having so much of it eaten up in fees, or give the money to him directly to use for the donation. I'm not sure if all deals run for a week from the time they are set up or if they all expire on Saturday, as mentioned in Morgan's post. I suspect each deal has its own expiration date/time. It sounded like he also wasn't sure on the cost of a trade deal. Also, I couldn't tell form his post if trade deals do indeed cost 2 million, is that specific to Siege or Mugen or the same on every shard.
http://stratics.com/community/threads/dear-citizen-of-new-magincia.300761/#post-2281008
Sighs. It's in the publish 81 notes on uo.com still. Another reason why I regret this was ever added; half the people running didn't even understand what the system was. And to be fair, a lot of it hasn't been announced, the EMs have been given briefings, I'm told off the record, about what sort of powers the Governor will also have, that aren't listed publicly anywhere.
But just to recap:
1.) Gold goes into the stone, from anyone who is a citizen
2.) When the Trade Deal is chosen, 2 million is withdrawn from the stone. For any shard.
3.) The trade deal, unless changed,
is permanent for that Governors reign, ie 3 months
4.) There's a 7 day timer on changing the buff. Once changed, another 2 million would be charged.
5.) You claim it as an individual every day from the stone in Trammel.
6.) The balance of gold on the stone goes down by 5% every day.
Someone told me they had to be Revered to claim the buff; I've not tested that because frankly, I don't need it or care any more what happens with the system. It's possibly not "Working As Intended" anyway, like the stones themselves weren't. But the patch notes have been up for some time and that's what it's supposed to do.