I think since it isn't general practice to play with wild cards...it is up to the house to define ahead of time whether 5 of a kind is a legitimate hand or not. My home game, we play best normal poker hand; since it is impossible to make 5 of a kind in a normal poker hand, it doesn't count - royal is the highest when we play wild games. Of course, those of us who play semi-seriously have gotten the game to non-dealer call, generally non-wild game status - now we play rounds of HORSE with Razz replaced by Omaha Hi/Low.

Once I played NL holdem at a casino night/Christmas party for a Home Building company - they had other casino games and you got raffle tickets commensurate with the amount of chips you had. In that game, the bb was not live and AKQJT was the highest possible straight, followed by A2345, since A2345 also has an ace in it...