In reply to Rick Rottman.

Right. It's legal, just unethical. How would you feel if someone was profiting over something you released without adding additional features of benefits?

It's the equivalent of scamming people that were unaware it was free in the first place.

It's like me selling WP core code as-is (without adding additional features or benefits) to unsuspecting customers for $50. It's totally legal, but I have a feeling the WP community wouldn't like me very much.