Agree with @Saulius on need for some initial figures around budget to support contributors and other DAO expenses, which is likely based on what the team is comfortable sharing re: historical expenses @coinflipcanada
10% as a level seems reasonable to me, knowing that these funds are controlled by the DAO and that any expenses will come from a (future) approved budget.
To start the thought process - any excess DAO profit from this 10% (less retaining a reserve) could also be used for buyback/burn. This creates an important tool in the DAO’s capital allocation and may be more important as the DAO sees operating leverage and less of that 10% is needed to cover opex as we scale.