Technically, for them to "lose" a customer wouldn't you have to be a potential or returning customer, and not just some jerk trying to get free service out of them before spending your money somewhere else?

Seriously, there are very few services a LBS can offer in the way of sales that cannot be obtained online. Fitting is one of them. I would have done the same thing in their shoes, and I'll bet dollars to donuts most everyone else here would too.

In short: I doubt there is an LBS on earth desperate enough to need a customer like you.