This year there is $350 max travel expense for everyone who qualified. But there are far fewer athletes in Orlando than Atlanta, mostly due to the change to the women's standard. Similar number of men qualified with the minute reduction.
Prize money has been largely stagnant since around 2010. It seems roughly 2000-2010 would have been the best time to be an American professional runner because the US was not great in terms of depth, only a couple top guys and a massive drop off. And it seemed like it was super easy to get a contract in that time frame. Some examples off the top of my head is LA marathon, used to be something like $100k for the win, now it's around $5k or $10k. Chicago used to be over $100k a decade ago, now it's less than that even before factoring in inflation. Rock 'N Roll series races used to have quite a bit of prize money, I believe they have zero dollars now. Tons of local races were doing $500 or $600 prize money 25 years ago, and those same races are still doing $500 or $600 prize money even though with inflation it should be approaching $1000. You used to have guys running 2:18 marathons on the verge of a contract. Now you have guys running 2:10, even some rare instances of 2:09 with nothing.