I've only down a few shops for them and the instructions have always had a disclaimer stating that mileage is not always paid.... It could be that they are trying to avoid paying mileage on shops at the beginning of the quarter so that they can better afford to pay it (and bonuses) later.
Hard work builds character and homework is good for your soul.
I've done quit a few shops for them the last two years and their offer always included mileage. Last year it was 0.36 cents. They clearly are now only going to pay mileage if they can't fill the assignment otherwise. I too was bummed about this change, as well as the apparent reduction in the actual fee they are going to offer.
Shopping up and down the Colorado Rocky Mountain front range.