This is a very good question. In my opinion sometimes it can be wise and sometimes not.
I think, if you have done some offline recruiting in your own neigbourhood, town etc. and you might have access to something "valuable" outside the SFI World - why don´t use it??
But I would never use it towards any PSA´s or CSA´s whom I have recruited online. In that case I would strictly stay within SFI related incentives.
