For Payback it would give an extra option for those who don't have PayPal or want to sign up but I'd have thought it would be of limited appeal given how Nectar points can be spent.
If an alternative is needed wouldn't Amazon vouchers be a better bet?
Hmm, points for buying phones and for topping up means giffgaff are giving you a, albeit small, discount on each purchase as nectar points for no extra benefit no themselves. I cannot see a financial or business incentive in this for giffgaff as they already offer reasonable prices and tariffs to benefit their members.
Yep agreed. Why don't you put this on LAB?
A very quick search in the Lab for 'nectar' reveals that the idea has been there since May 2014 and in the intervening period has received just 44 votes.
I would suggest no-one holds their breath waiting for this to be implemented...