I bought 4 rolls of kennedy half dollars..73-83.are they worth anything?

On eBay, any year they are ASKING for at least .99 + shipping. These dates don't sell unless they're high-grade uncirculated. If you paid face value for them, you MIGHT make a few dollars selling them as one lot. But you'll lose money trying to sell them a coin at a time, with all the fees. Selling a $1 item costs 12 cents for eBay, if you have any 'free listings' with no listing fee, and 38 cents for Paypal (35 cent base transaction fee plus 3%). So your 50 cent profit is gone, just to fees. Never mind all the time you spend.