I *really* doubt that. I'd be quite curious to see how you arrived at that conclusion (or who told you that). The DR curves on crit make it almost pointless to use more than the "standard" amount, and the crit contributions of primary stat aren't so massive they they completely supplant Power. Most calcs I've seen weigh Aim at roughly 1.1-1.2 times the value of Power, at worst.

I'll dig out my spreadsheet when I get home. It's the standard "weighted contribution by ability usage ratio" thing based on a 6 minute combat dummy parse. The only non-standard thing I do is consider weightings over larger chunks (18 points at a time, in my case), since I didn't feel like doing calculus when I put the spreadsheet together.