I am cheap! I shop for price. But I value my two LBS. I probably have spent under $200 at each since I started riding last June, so I'm not a money maker for them. But I treat them with respect, I make sure I thank them when they help, I make sure I pay the low-brow LBS with cash because I know that's his preference, and I've even tipped them $5 a couple of times. The employees at both shops know me and they have given me fantastic service, several times at no charge. I've had 3 mechanics at once give me their preferences and advice on which handlebar tape to buy. They have interrupted their work to re-install a crank set that I had done incorrectly on a Saturday.

A LBS is almost undoubtedly not a very profitable business. I would expect that the most expensive items have the lowest markup and the cheapest the highest markup. Probably the most PITA parts to find and sell are going to be exactly what you were buying. Since you had to go to "a few" stores to get this small number of parts, they were probably pretty obscure parts. Ultimately you did get exactly what you needed. That's wonderful. That's worth something, IMO. And maybe you would get a lower price for the loose ball bearings if they knew you, if you were a regular.