My theory is just that it's an entirely different character, and not just a slight materials and accessory change, like the Jawa. Also, the chase Jawa seems to have been about twice as abundant on eBay lately as well, but that's really not saying much...
I've been keeping track and from what I've read, the Logray/Jawa are definately about 1/96 each. Neither was shipped more heavily than the other one.
I think I'd agree that the reason that you see more Jawas are the fact that he's a variant, not a new figure. I think more people are willing to part with the chase Jawa (and get some phat cash) because they still have the regular Jawa from Series 3. I don't think as many people part with their Logray because he is a unique figure.
Just my $0.02,
Well that makes sense. I was going to say the same thing, but you said it good enough for me.