Small teams often get the highest leverage: no dedicated ops, everyone context-switching constantly, and every departure existential for knowledge. $300 a month against a founder's reclaimed hours pays back in the first week.
The smaller the team, the more each person is the documentation. Heidi gives a ten-person company the institutional memory and the delegation capacity of a much larger one, which is precisely the phase where that is a survival trait.
Founders are the proof case: morning briefing instead of tab-cycling, follow-ups that schedule themselves, and an answer machine for the questions that otherwise all route to you.