It might be nice to know what percentage of sales is coming via upsales, wha the average upsale % is per order. and the number of each upsold item (ie which are the most popular items via upsales). Less important but interesting would a comparison between the item sold from product page and via upsell - for example we have some products we think are only selling via the upsell page and that might give a clue that certain item needs to be featured or promoted better as the upsale page is only good for a few items at a time without becoming cluttered.