Forgive me if this is a stupid question, but it's something I've genuinely been wondering about.

Why use some spectacular monitoring speakers when mixing? After all, the almost everyone in the general listening audience out there doesn't have them. Wouldn't it be better to make sure the mix sounds great on some middle-of-the-road commercial stereo speakers, since that is realistically where your mix is going to be played?

I'm not sure I really buy this line of reasoning myself, but I'm just wondering what you guys think.