As long as you waterproof it to some degree and add some cooling, nothing wrong with it at all. Actually "plane" esc's are usually MUCH cheaper than "marine" esc's. Of course as Dom said, you might need a pistix..........but I know someone who has a new unused one.........lol.
My first ESC was aircraft :-) (Turnigy Plush 80A ~50$)
I made watercooling plate by myself (copper + brass pipes + thermal conductive glue).
No problem running 60A on my first 20" mono - 380L and cheap 5,3Ah lipo 7,4V
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