Besides the monetary cost, there's the opportunity cost of dealing with licenses in the first place. Part is compliance (Does your company have current licenses that cover every bit of software on every virtual machine on every developer laptop? Can you prove it?) and part is procurement (Do you get the plan with free upgrades, or do you buy new? Will you need enough licenses over the next two years that you should get a site-license or is it cheaper to stick with single user licenses?).