"This is one of the many few reasons why [noun]That's right, MANY FEW.
It somehow sounds better than either "many" or "few" by itself. More rhythmic, balanced.
Plus it's handy when you want to emphasise the "few" good reasons but in a positive sense. Like when you want to point out the best feature of your product but make sure that the customer knows that there are other features that are just as good too but not trivialise the very important feature you are explaining right now but... Forget it.. I did warn you that it was a hair brained idea..