There are a number of reasons but simplified it is two-fold. Firstly from a technical and performance perspective, our technology is built on the basis that it is the only programmatic stack or header bidder wrapper in your page. Multiple wrappers cause conflict and ultimately will damage your performance.
Secondly, Venatus have highly aggressive and global sales teams. We, therefore, require that we are the only sales teams in the market pitching your site to agencies and brands. Multiple sales companies can cause confusion in the market, undercutting of rate cards and channel conflict.