Jeff is the Kurt Cobain of wrestling. He coulda been a contendah. 5 star matches, memorable promos, all that shyt is fine and dandy, but when the wrestling audience CARE, that's when money is made. For all the tools he was lacking, he never stepped through the curtain to a tepid response. His floppy ragdoll selling style, his "edgy" proto-emo swag, whatever it was, a lot of people (primarily chicks and tweens, perhaps, but even still, a lot of people) bought in and supported the guy for YEARS AND YEARS.
There were a LOT of better musicians than Kurt Cobain, but certain demographics were buying what he was selling in a big way
Total conjecture, but I'd bet that if you could somehow poll every WWE fan and have them rank their all-time top 5 favourites, Jeff Hardy would place higher than Edge, by a lot. That makes him a bigger star in wrestling to me.