I believe your question is actually two in one. =)
1) LiteSpeed does not currently offer discount for VPS customers or shared hosting customers.
2) Our license is tied to to the number of "real-cpus" exposed your server. For example, if you are fortunate enough to have 16 CPUs and partition those resources into 4 virtual servers of 4 CPUs each, then each server would need the 4 CPU license for maximum performance. You can use a 1 or 2 CPU license on a 4 CPU server but you would not get the maximum performance and scalability.