Workers have more drawing power in the WWE because the WWE itself has more drawing power than most of the roster.
The 2012 Observer Newsletter article reposted here: http://forums.prowrestling.com/showthread.php?t=111077
Concerning the history of box office draws is relevant to this discussion and an interesting read.
IDOL, you are right - but that is to conflate a workers push with a workers ability to draw - as far as I'm aware - 'overness' in TEW pertains to the ability of a worker to draw, rather than how they are necessarily perceived or pushed.
The reality is virtually none of TNA's roster should be anywhere near 70, or even 60 - based on their ability to draw crowds. I would actually wager, that the TNA brand probably draws better than most of their roster (as it is with the WWE).
Obviously Hogan, Sting, Hardy and Angle are draws (though not particularly strong ones these days for the most part), but none of their largely indy-cum-'TNA stars' are actually draws; even if they are over with the TNA fans. They would be and are virtual unknowns to the mainstream wrestling fan. I would add the Dudleyz up on TNA's list, but they scrape the 60s (higher maybe in the tri-state). The rest of the roster, despite their push are not draws and should, accurately be rated as such.
On the WWE - the confusion between push and drawing power is plain - the list posted above is essentially true to the card structure but not to drawing. Randy Orton for example is leagues ahead of Bryan Danielson as a draw, but on that list are rated almost identicially. CM Punk even outrates them, which just isn't true (in the case of Orton). Even if Punk is pushed as a main-eventer, he is not a box office draw.