Start with the cost of staying. If nobody is managing your spend against a modelled allowable CAC, you're paying for that gap every month, budget held back from campaigns that could afford more, budget still running on customers you can't profitably buy.
It compounds, and it never shows up as a line item, which is why it survives year after year. The switch is the smaller risk.
Your engagement starts seven days before kickoff, the moment the agreement is signed. In that week we confirm platform access, configure server-side tracking and the Conversions API, audit your creative and rebuild the account structure, and build your campaign calendar.
Day one is a kickoff call with campaigns already live: no dark period, no month of spend paused while someone gets up to speed. Then you have 14 days to tell us we're not what we described, and your first month is refunded.
Switching costs you a week of overlap with a full refund behind it. Staying costs you the gap, indefinitely.
And if your team is already running against contribution profit and hitting their allowable CAC, keep them, we'll say so on the call.