Mostly because 1) The article I read said he was trying to invent a cancer treatment with these radio waves, and 2) It seems to have been a happy accident that he found out the waves would make salt water burn.

Generally, does producing radio waves take less energy than electrolysis? This is something I haven't found, but it seems (based on absolutely nothing) that it would be the case, especially since you could (presumably) supply the RF over a much larger area than electrolysis would be feasible. I wish they would have included the frequencies and that sort of detail so others could verify (or disprove) rapidly.

It does make me wonder (if this is true) what these frequencies would do to a person since we are mostly salt water...

On a psuedo unrelated note, I saw some stories recently about RFID tags and the such causing cancer in animals due to irritation at the implant site. Have you seen anything/have any insight into that?