Mine is 5 years old and just a cover with a yearly thorough spring cleaning/wipedown followed by the occasional monthly cleaning it still looks as good as new. IMO, just keeping it from direct exposure to the elements as much as possible will make it last till you want to buy a new one.

M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70