When I worked at Lauder I did not get commission, we worked on levels. That is we had to sell a certain amount every month to maintain our pay rate, if we sold more we got more $$ and vice versa.
The SA's who get commission, as far as I know get paid on any EL SKU they sell so it would include solids and compacts.
I think EL should take up the Louis Vuitton approach to overstocks- they would rather destroy the merchandise than sell at a discount. Ever see your LV store having a sale or 20% off? That is why people are on waiting lists for months and vintage and new Louis always retain their value.