He’s hoping to squeeze every last dollar out of this campaign grift. The last big push before Election Day is just the lube he needs to get deeper into the pockets of that glorious Wall St. money that he desires so much.
As for the venue, that’s probably gratis between two buddies. If anything, JD is paying Trump to show up.
The scary part is these are more signs that he doesn’t really care about winning the vote and he’s got other plans for how to get into the White House. He just needs a close enough finish to make whatever claims stick.