I'd like to see them improve the IT around, or maybe get rid of, the barrage of e-mails. And learning grammar, too, would be nice.
Offer $50 good for a week, see if that results in sales. I still think it is nothing more than a fluke when these one day offers are taken up, and frankly from a business point of view, someone planning to buy today, on WS, does not need to be given $50 off a fare. A week to use might stimulate sales, a day to someone already booking their fare, just loses money. And in my case, no e-mail - just free $50 that was great but cost them $50.
However here's a tip -if you are booking, use one browser tab to set it up, then close, wait 10 minutes and do it again and maybe you'll get $50 bones. And of course an e-mail late and useless but discard that and you're up $50 simoleons.