Look at it this way: A good "business guy" is going to be a shrewd negotiator, using every trick in the book to maximize the value of your company in every deal. S/he will go to great lengths to make your company look bigger, more capable, and like an excellent fit in every introduction, meeting, and potential sale.

However, every one of those negotiating skills is going to also be put to use when negotiating salary and equity split with your company. It's a double-edged sword.

I don't buy into the notion that business-minded people undervalue engineering talent in general. Sure, there are plenty of anecdotes otherwise, but the savvy business people know exactly what engineering talent is worth. However, that doesn't mean they won't still try to maximize their own share of the company's equity and payroll. Meanwhile, they have every incentive to minimize the amount of equity and salary handed out to engineering talent so they can hire as many people as possible without spending a dollar more than necessary.

It's not personal, it's just business. I'm not suggesting it's right, of course. Learning good negotiation skills and how to sell yourself well will go a long way to leveling the playing field.