It depends on the field, Mike. In some fields, experienced sales people get a six-figure base plus a "guarantee" that can be even higher. It's not uncommon for a salesman in a small company like this to have a higher base salary than any other employee (that was the case when I was a business development director for a start-up -- I remember the CEO giving me crap about that before I brought in the company's first sales).
In any case, as I said, a good salesman will more than pay for himself soon enough. If I had the requisite background, I'd jump at this sort of opportunity. How hard would it be to sell this stuff to, say, the North American subsidiary of Rio Tinto, when the company is already using the stuff in Australia?