It really makes no sense and, as mentioned, it's actually a detriment to sales for a lot of us... and I say this as a Prime Member who DOES get that extra discount. The thing is, the policy might make sense IF the maximum discount that items go on sale equaled the value of the Prime clearance discount, but in these days wherein 60-70% off sales are not uncommon, the math simply doesn't work out in the customers' favor. The end result is that I rarely buy anything that's marked clearance except on those rare occasions when the entire clearance category is on sale... which is why that while I own ALL of Xtrart's current product, I still haven't bought a large number of that artist's clearance items.