Change In Affiliate Terms

I will be changing the affiliate terms a bit, specifically the bit about the Paypal transaction fee. I don’t know what I will decide in the end but it’s one of the following:

a) absorb the full cost of the transaction fee so all affiliates will have a true 90-10 earning/commission rate (or whatever the commission rate is agreed upon at the moment)
b) split the transaction fee to either…
1) affiliates will take up the 2% and I take the $0.30 fee
2) affiliates take 1% and I take the other 1% + $0.30 fee
3) split the cost 50/50 depending on the final total of the Paypal fee

I think the easiest all around would be A because there are a lot of situations in the B examples that can get a bit dicey and complicated. For example, what if a customer bought from various affiliates at one time? Why should all the affiliates get charged the Paypal fee? Talk about a headache!

Hrmm… I’ll think about it some more. :\