As a professional Amazon Vendor, calculating profitability across multiple marketplaces is challenging due to the lack of a straightforward way to visualize vendor marketplace data in one place. Key areas to consider include Amazon cogs and distribution costs, terms and charges, chargebacks, and marketing efforts. To accurately calculate profitability, it's essential to factor in all these costs, including damage allowances, freight allowance, subscribe and save, co-op activity funding, and Automated Marketing and Marketing Development Funds. Additionally, tracking sales velocity, weeks on cover per SKU, and measuring profitability by SKU, product group, marketing mechanism, and Amazon marketplace are crucial for avoiding unwelcome surprises. With the right data connectors and tools, such as CData Virtuality solution, accessing current Vendor sales data and advertising costs becomes easy, enabling a more accurate calculation of vendor profitability.