How do you scale a search arbitrage campaign?
Raise spend gradually on what is already profitable, and watch whether the margin survives. Typical steps are increasing budgets in small increments, duplicating winning ads into new audiences or countries, adding related keywords, and expanding to a second traffic source. Each step usually lowers return per dollar, and feed caps or cash limits may stop you first.
Scaling fails for predictable reasons. Larger budgets push the platform to buy more expensive clicks, so CPC rises. Big budget jumps can restart the learning phase. Winning creatives suffer ad fatigue. And the feed side has limits: a new partner may be under a feed cap, and sudden volume from a new source invites a quality review.
A cautious method is to increase budgets by a modest percentage at a time, confirm RPV is holding by keyword-level reporting, and keep the cash-flow float within what you can fund. Spread risk as you grow. A business at $20,000 a day on one feed, one ad account and one keyword has more concentration risk than profit.