In other words, a deal is only good if it's good for both parts. I would offer a potential partner 100%, but make clear I then wouldn't do any work myself if I

In other words, a deal is only good if it's good for both parts. I would offer a potential partner 100%, but make clear I then wouldn't do any work myself if I didn't got a share. If both are equally dependent on each other, then a 50/50 split sounds just.