You had to land, maybe on dodgy knees. Laboriously climb back into the ring. Worst of all, you ended up close and personal with the punters, and if you were a baddie, this could be dangerous.
So I never ever recall Steve Logan exiting the ring.
Nor Robby Baron.
Any others?
Interesting question but almost impossible to answer. Sam Betts reckoned Pedro the Gypsy refused to be thrown, so I reckon he's a good bet. Must admit I saw a lot of Pedro, always enjoyable to watch, and it never occurred to me he wasn't thrown.