I'd agree that you do not need to worry about having a shoal draft - there will always be buyers who either won't be that bothered either way or can appreciate the added accessibilty that the shoal draft offers. Another advangtage that shoal draft offers is especially significant in today's tight moorage market - you can put up with a shallower slip in tidal waters with shoal draft.
I'm a bit surprised that you are having difficulty finding a boat in your area, though. the selection in the Seattle and outlying areas has always seemed good to me.
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
1984 Fast/Nicholson 345 "FastForward"