But Blu-Ray movie sales is what this topic concerns itself with. As well, the PS3, at the time of launch, being the cheapest and best Blu-Ray movie player available, has helped Blu-Ray massively.
The point? Microsoft has earned money off the back of Sony (since any PS3 owner who bought a Blu-Ray movie, contributed to Microsoft's earnings through licensing). It wouldn't be all that hard to swallow for the BD Association to earn some money off the back of Microsoft.