Yeah, I don't think that's because you're a tech person. To most parents, their children may as well be tech experts because their bar for that is simply "they know more about computers than I do." I'm sure most people could probably convince their parents to buy a Macbook, or any other brand of computer, for even arbitrary reasons.

I may be wrong, but I'm highly skeptical that your parents had to be convinced to be a Macbook on the merits of it's technical prowess in relation to other competition. They probably just respect your opinion on technology regardless of what it is.