Edit cully beat me too it lol as i was typing my reply
yes smashed screens plasmas arnt cost effective to repair i do a fair few lcd tvs as a hobby even those with smashed screens arnt usually worth repair i just keep all the circuit boards from them. if i was you and the set still powers on ok i would sell the boards/stand on ebay etc as you can get a good price for them even more so now plasmas are not being made no more.
yes smashed screens plasmas arnt cost effective to repair i do a fair few lcd tvs as a hobby even those with smashed screens arnt usually worth repair i just keep all the circuit boards from them. if i was you and the set still powers on ok i would sell the boards/stand on ebay etc as you can get a good price for them even more so now plasmas are not being made no more.