That's why I said "expect". However, I'd still expect a dentist to have good teeth, even in a two- or one- dentist town. I expect a dentist to know all the tricks of having good teeth, like flossing, brushing after every meal, etc. If he sees a nasty cavity that could lead to bad teeth, I expect him to go and visit (even to the point of going out of town) another dentist who's just as good or a just a wee bit worse than him. Unless he's a self-schooled dentist who doesn't belong to any medical association, you'd expect him to have some contacts. Barbers probably are different since it's not the sort of profession where you have to pass an exam to get licensed, "high-end" hair "stylists" excepted.
Similarly I'd "expect" the MySql site to be free from, at the very least, exploitable security holes in their "star" product, even if that can never be true in practice. Image counts for a lot.