ebay do act on it and they take it very serious. I have been done, dont think bad of me, I only bid my item to a price I happy with (on day one) and i never increase it after that, i see it as putting a reserve on the item without paying the reserve fee.
If ebay was a little cheaper or even free to list then these sort of things would not happen imho, i dont see why they charge you to put a reserve, at the end of the day they only win by taking a larger cut if the item sells.