Hey, I won lots of money as a young marina-monkey in high-school off those drain-plug deficient owners. Faced with a $250 yank-out and dry fee, I'd offer to empty their boat for forty bucks as long as the spark plugs weren't underwater.

I'd push it out of the slip, jump-start it and then run it balls-out across the lake. Physics would drain the hull as it planed out above the water-line and then I'd stick in the drain plug, return it to the slip and collect my cash.