Yea, I love the idea. I just don't see GitHub as it is today being all that similar. The comparison didn't come to mind. I think a response like this is typical from most people you mention your product or service to. The typical response is to compare it to a large product or service. I think you need to be aware of these large companies, but that in general this feedback isn't worth much.
We're also complementary to github since we allow developers to import their repositories to binpress and add a commercial layers on top of it.