This has been a major flaw in the entire clearance system. In theory the lower "regular" clearance price is supposed to make the items in question more attractive, but at 35% off it really doesn't match the discounting level of regular sales. So with 50/60% discounts on regular merchandise becoming increasingly common, the end result of not letting sale discounts and coupons apply to clearance product is to make them MORE likely not to be sold. At least if you're a Prime member the discount ups from 35% off to 55% off, but the vast majority of Renderosity customers are unaware of that, and Prime members only make up a small percentage of the overall pool of buyers. If the real goal is to incentivize the purchase of slow moving products, it would be far more effective to a.) drop the "clearance" marker from clearance items when they're covered by a larger sale or, as that's most likely far too labor intensive, make the clearance discount smaller, but to let regular sales and coupon discounts always stack on top of those prices.