My preference is always to be tolerant of things like this, at least until it clearly crosses a line clearly stepping into overt advertising outside of the accepted forums. That said, if it really annoys you then you could use the little blue exclamation mark to send a note to the mods with an explanation of why you think it's a problem. I'm sure they'll consider it and let you know.
Personally, I've not really noticed a problem, though I still have signatures enabled.
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