Well, since the vast majority of his campaign money is presently coming from himself, are you trying to say he is getting rich by paying himself?
No, I'm saying when the donor money comes in (and it will), the donor money will pay off the loan he made to his campaign. The money he loaned the campaign has been used in large part to pay himself via businesses he owns. The mark-up after expenses is, of course, profit.
Looks something like this at the end of the campaign:
Loan to Campaign = $X
Loan Paid via Donor funds = ($X)
Net Actual Change to Trump = $0 (i.e. no loss)
Profit to Trump
Spending at Trump Business = $X
Cost of Services = ($Y)
Profit (X - Y) = $Z
$Z is the profit he "earns" by running for President of the United States.
Now, other candidates can get paid for running (I recall hearing you can take a "salary" equal to what you'd get paid for the Federal office for which you're running). That's how Hillary has paid herself the $$$ mentioned in a recent story posted on FR. But (<--big butt, and not Hillary's FYI), Trump can effectively do this in many multiples of the US President salary because it's funneled through his own businesses. Effectively, there's no real limit on how much he can do this via marking up the services he is "selling" his campaign. The only limit is how much he can spend on the campaign and how much he thinks he can cover via the donations that will come from folks seeking favor should he get the nomination.
As I mentioned to another poster, this is brilliant. But it also an example of a politician making big $$$ off of the process, which we're being told isn't who Trump is. It is an action versus message problem for Trump.