Not getting the message applies to more than the risks discussed in my earlier posting. If your abstract significantly exceeds our 1,500-character limit (and I’d call 3,000 “significant!”), the probability is 100 percent you will be asked to shorten it. I tentatively accepted 5 papers this morning , all of them on condition of a shorter abstract.
The size limit is not just a bureaucratic whim, something to help page layout. Including extraneous information hurts your chances of being read and cited! Less is more!