Questions on point buying

Was looking at the Wizards' half point buy chart and had a question. According to the Wizard, the fair price for buying off/on a 3 in NFL is -$1.28
So, if you want to go from 3.5 points to 2.5 points would the fair price be -$1.46 which is the original -1,28 +.buying off the 3 again which would be another.18?
Also, do his numbers apply to college football as well?

Quote: twentyfour

Was looking at the Wizards' half point buy chart and had a question. According to the Wizard, the fair price for buying off/on a 3 in NFL is -$1.28
So, if you want to go from 3.5 points to 2.5 points would the fair price be -$1.46 which is the original -1,28 +.buying off the 3 again which would be another.18?
Also, do his numbers apply to college football as well?
link to original post

In general the same applies to college but generally points in college football are worth less as more points are usually scored. I rarely buy half points because I am generally satisfied if I push.

If you are buying points it is generally better if the total is low then you are getting more value for your buy.

Good points. Thanks.
What say you on the -$1.46 calculation for going from 2.5 to 3.5?