I dispute your assertion that PS3 attachment rate has improved to 3.6
I have two problems with your sources.
1. They contradict each other. You used one source to pull the 3.6 (actually 3.4) for the PS3 number then used the other to pull the MS number of 3.8. However, the MS source has the PS3 attachment rate far below 3.6 at 2.3 with both reports seemingly citing NPD figures from Feb. I find using such sources while ignoring such contradictions disingenious at the most and convenient in the least.
2. Your 3.4 source if Im not highly mistaken doesn't know the difference between tie in ratio and attachment rates in relation to av number of PS3 games owned by a PS3 owner. That report states attachment rates of 3.4 for the PS3 and 3.6 for the Wii while stating the previous month of january of being 2.7 and 2.2 respectively. Yet this
http://biz.gamedaily.com/industry/feature/?id=15503
refer to those numbers as monthly tie in ratios and not attachment rates. For the attachment rate of the PS3 to jump 0.7 games last month would of required the movement of around 1.3 million PS3 games in the US. I think you'll find that didn't happened.
If Im highly mistaken then I apologize. If not then maybe you should resolve any contradictions or inaccuracies before citing articles to build an argument.