By default, the system aims to maximize sales within your budget constraints. If the return on ad spend (ROAS) is unsatisfactory, you can set a target ROAS. The system will strive to meet this target, although actual results may vary due to factors such as the saleability of SKUs, subcategories, and brands. The system filters out lower-quality traffic to ensure you receive sufficient high-quality traffic to reach the target ROAS. This approach may lead to reduced revenue but increased profitability.