You guys realize that for every unit sold these companies (outside of Nintendo) are losing money on the unit sale, right? So it's always better to look at the software sales, assume their MSRP, knock out the cut to brick-and-mortar and what the publisher retains, take the remainder and multiply that by the split of unit sales for a given platform.
Now do that for all the games, and weigh it against the losses on each unit sold * the number of units sold. That gives you a better picture vs. just looking at units sold.