Well Leo, I don't think it's a bad thing to dream about such content, if that's what the dreamer really wants. However if you mean they dream way too much of it, then I would have to share the same oppinion as you.

I've had a few of 'those' dreams myself, as I believe we all did at some point. I just found it to be a waste of lucid time to focus on such an obsolete task - I rather try other interesting stuff, for variety's sake.