"I honestly expect him to lose the primary and then run (half assed) as third party just to push his way into debates the way Ross Perot did."
Interesting point. I should have added that as a betting option. That would be a disaster for the GOP, because even if he peels away a small amount of the vote... I imagine there would be a lot of pressure on him not to run as a third party candidate, but he does have a Trump-sized ego.
"but the real money should be on hillary clintons fate and outcome?"
Betting markets currently have her at between 1:4 to 1:7; in contrast to Sanders who is at approximately 10:1. You might want to think about that. If it helps, Clinton currently is in better condition (in terms of endorsements, money raised relative to the field, and other markers) than any non-incumbent Democratic nominee, ever. I'm not a Clinton fan, but saying she is in worse shape than the clown car that is the GOP field is, well, interesting.
"Think of how much more Donald will make after a run at the presidency."
While running is lucrative for the crazies, like Santorum, because it helps their brand (speaking fees, media appearances in the off years), it will certainly cost Trump money both directly during the campaign and afterwards. Businesses aren't big with controversy, and while there will be groups of people that may like him more, his business brand will suffer, as it already is. This is a vanity project- not a rational economic decision. The amount he loses in business opportunities > than the amount he will gain in book sales, speaking fees, etc.