Price most often. Licenses for the top-end ESXi run $1000 - $3500 list per socket [1]. If you have a large deployment you're going to be inclined to go for the

Price most often. Licenses for the top-end ESXi run $1000 - $3500 list per socket [1]. If you have a large deployment you're going to be inclined to go for the top-end license in order to support distributed switching and granular control over storage/network traffic.