Shotgun does not publish a standard organizer percentage. It does publish a resale cap of 15% up to $30, and a waitlist fee of 15% up to $50. Those caps are not the platform fee.
Independent promoters should model three ticket price points and expected sell-through before choosing a stack for the season.
Tickean is one option: the organizer keeps the ticket price, buyers pay 10% per paid ticket with card processing included, and that ticket price is paid out within 2 business days of the sale. Venue-required vendors still come first.