I understand your concern regarding the cut, and I'd like to thank you for bringing it to attention.
To give you a more specified perspective, I've spent around 8 hours so far working on the bundle, and plan to spend about another 8 between making sure everyone approves and continued advertising. This is how I was able to justify the 4% cut with myself; it's likely that everyone else only has to spend a few minutes between submitting their games and promoting it on their socials, so it seemed fair to compensate myself for the hours spent. If you or anyone else thinks that 4% is too steep please let me know!