During the early stages of your business, you need to keep business overhead down. Try to be reasonable. How much compensation can the business afford? You may have to make some sacrifices or think creatively.
Your company operates in the real world, so it should pay salaries at a realistic level. This means at or near industry standards.
This gives you credit for the fair value of your time. But it postpones compensation.
This is another form of postponed payment. Rather than treat it as a loan, simply start with a lower salary. It can rise later as the company matures and is able to pay you more.