I once had the same idea, though a mod told me that they'd rather have it on their profiles because they get notified every time someone posts there. Unlike here, they'd have to check every post. Though I guess there are pros and cons to this.
I have to point to @SirLegendary 's post about this not being the course of action we prefer for reporting spam @Andelhofs... I like your initiative, as we've said to SirLegendary in the past, but the spam reports need to be posted on profiles with a link for better and quicker handling.
I'm going to lock this thread now, which I'm sure you understand.