“and just like my boss needs to pay all his expenses I can expect him to pay me a regular salary?”
says who,
What do you mean by a regular salary? Was the beginning pay low for the market? If so, you seem to have taken the job anyways. If this is what the owner could afford, and for reasons of your own, you needed to take the job, there seems to be rationale for a normal annual raise, if you’ve done a good job, but not a major salary overhaul, unless you’ve been the cause of a significant turnaround in the company’s finances. It doesn’t seem like that though, based on your description of the business.
Hatzlacha!