Trump has yet to show that Trump doesn't come 1st and all else are losers.
The man is a multi-billionarie. He's not only famous for that, but as an entertainer as well.
What does the Prez job pay today, something like 400K a year?
Trump spends that much money in less than a week at times. So to say that Trump has not demonstrated that he doesn't come first, he's doing so right now, because financially, he could be doing a lot better things than SPENDING money to get a never ending job that pays only 400K a year.
If elected, taking this job would be a huge sacrifice for him. For most people, being elected President would be a huge step up.
And to be honest, when he started all this, I don't think he took it all that seriously. He ran for the hell of it and perhaps pad his resume. But now that he sees the people calling him to duty, he's going to do his best to take that office and do what the people expect of him.
For most people that run for the office of President, it's all about selling books and making expensive speeches when it's all over. For Trump, it's a huge financial loss because of his patriotism.