Over the weekend I checked to see seating on my Wednesday evening (non prime business) ALT/MIA flight on an E175. 2 seats left but still selling upgrades for $97 so I took the offer. Not going to be many upgrades on that flight. When we get to the point where an EXP misses upgrades on a Wednesday evening E175 (or CRJ900) flight you know percentages are going to plummet.