Is BBB method more economical?

[fission7x]

I must be doing something wrong. I've been thinking that the BBB method was less expensive than using pool-specific chemicals, but the math doesn't add up.
I read on this fourm somewhere that 1 pound of pool-specific granular chlorine is equal to 2 gallons of 6% bleach.
From various places on the web, 50 pounds of stabilized granulated chlorine runs about $155. The liquid bleach I have been using is 5.25% bleach and costs $1.70 per gallon. With reference to 50 pounds of granulated chlorine, the equivalent amount of 5.25% liqud bleach would be 114.29 gallons. This much bleach would cost approximately $194.29.
This doesn't seem economical to me.
Are my comparisons all screwed up?

Of course, this is neglecting any effect pool-specific chlorine has on CYA levels.