If you help me I'll 'make it worth your while'. [=I'll make it worthwhile for you; I'll reward you for helping me]
Seeing my children's joy made building the tree house all 'worthwhile'.
The money is for a 'worthwhile' cause/charity.
(..) But be careful. I'm a real Don Juan. Politicians are sexual powerhouses. So beware. Here's a secret to make your trip worthwhile. I'll do everything necessary. One term. Then I'll go. I'll quit politics. - And then. - Then what. (..)2016 Me Before You