Baron, if that is true, then why do salt lakes exist throughout the world (e.g. Mono Lake, Great Salt Lake). These are lakes where all the streams carrying mostly fresh water drain into. The reason they are salty is because the rivers carry a tiny bit of salts, groundwater brings up salts, but most importantly, the evaporation rate where the lake is higher than the freshwater input rate, so the lake stays salty.
I agree, there are lots of salts coming from water circulation through the oceanic crust (black smokers being an example of this circulation). And maybe you are right, and that the oceans are different than the lakes. It is a rate question I guess.
kris