As a store and Crafter I would suggest the 50/50 split.
We have just completed our first 1yr and 1/2 with a 60/40 split and it is tough to cover expenses..and we spend VERY little. We do not even take a salary.
What we have found in the transition is that the artists that make better quality work will stick around with a 50/50 split.
Also, you will have new costs aquiring customers..that extra 10% might make a huge difference.
Good Luck...If you have any questions, I'm glad to help.