I still have my 09 Rome Crail in fantastic condition, it would still be like new if it wasnt for the shitty snow in CO last year. I road over a few rocks and tree branches.
it's always nice to have a plan "b" but still would suck if the board broke as you wouldn't be able to warranty it.
So I guess that's the risk you've gotta weigh: you can pay $250 for a board with no warranty that most likely won't break or defect anyways, or you can pay $400+ for a board with a warranty (that most likely won't break or defect anyways).
From a strictly financial POV, paying $150 for "insurance" (that's what a warranty is, really) on a $400 board is asinine. But almost all of us do it, because the warranty price is built in to the price of new/unused boards and there aren't any other options.