No, it doesn't...and it doesn't take a financial whiz kid to simply look at fuel burns alone (not even considering capital costs or depreciation) to know that.

Not exactly apples-to-apples for airliners, but the 2010 Business & Commercial Aviation Operations Planning Guide shows the Challenger 850 (nee CRJ-200) with an operating cost of $2216.28/hr and the BBJ (nee 737-700) @ $4065.52/hr given a fuel price of $4.90/gal...which is probably double or more what airlines pay.

Now, if you're talking about the cost involved moving a total number of pax seats...then yeah, 3 RJs for a single 733/737 doesn't make any financial sense at all unless an airline can enhance revenue due to more frequency options, which most can't.

I did one of those kinda trips when I was at AWAC from PHL-MSP for the NCAA Basketball tournament; 3 CRJ2s left PHL within 15 minutes of each other heading to MSP because Airways didn't have a narrowbody available.