I wrote about a recent experience here: http://www.roadfood.com/Forums/New-Pizza-Hut-Marketing-Initiative-BaitandSwitch-m655673.aspx
I have experienced less of them in recent years and I have a hunch the Internet may have something to do with it. People who get stiffed now know how to post messages with titles that get picked up by search engines.
A lot of the problems were the result of frisky franchisors who published coupons and offers in the media without giving any compensation to the franchisees. Tom Carvel was notorious for this in the NYC metro area when he was still alive. I understand Quiznos franchisees are or were up in arms over their couponing.
I still see some franchisees of burger chains not honoring the advertised special. For several years now, I have made it a practice to noisily walk out of chain restaurant branches (buying nothing) that refuse to honor advertised specials, unless that location is listed as an exemption in the ad. I consider it to be bait-and-switch advertising.