If you get your Bachelor's degree, say, from Asia, and, say, your Master's from the US, and you are currently in the US, it would be much easier and faster to get your documents ready for your American degree than for your Bachelor's degree. Besides, it is mentioned on the CIC Instruction Guide 7000 (for FSWP), that you will be awarded points for the highest educational credential (Canadian equivalent)
They don't care about the total number of years anymore.
If your Master's degree somehow got evaluated only as a Bachelor's, then there may be an incentive to get your other Bachelor's degree evaluated too to claim maximum possible points. If your degree has already been evaluated as a Canadian equivalent of Master's degree, even if you have 5 other Bachelor's degrees, it won't improve your educational points.