Day-timer

Finally bought a 2010 day-timer! Still, just under 5 bucks before tax. No discount. There were only 5 left. 2 in green and 3 in blue. I thought picking green, like a "green light", might give me a boost. (Superstitious?) But the colour doesn't look that good, and I'm feeling "blue", so I followed my feelings. Not that I want the whole year to be "blue", though.

Michael's got day-timers for $1.50 since last December. If they weren't the thick type, I'd have bought those. My question is, why does a thin one cost 3.3 times more than a thick one??? Doesn't make any sense!