Really it depends on your definition of thrashed. I mean if there is thikngs that are making the board not ride correctly then you have an issue, like a half tore off molded fin or something. But if it just has knicks and scratches on it I wouldn;t really swet it. They are sort of the nature of the beast here,l I hit tons of sliders, docks, rocks, stumps, really anything thats out there and destroy me boards, But I keep riding them till the snap or they are so chewed up they cut my hands up when I grab.
A good 2 part epoxy will really work to fix an major issues, but like I said, a wakeboard is a tool eventually they break.