I worked my way through college as a bicycle mechanic. I don't think I ever got tired of talking about bikes, though I did get sick of fixing them after a while.
When I lived in Denver, I went to the Great Divide taphouse a lot. One day I was chatting with one of the brewers, and I asked him some question about brewing, not specifically related to their operations, just some general question. He basically said it was a trade secret. Then we got talking about bicycles, and he had some problem with his that he wanted to know how to fix. I told him it was a trade secret, and that if he wanted to come to my shop and pay me I'd tell him.