Well I mean they obviously can...

First of all you're assuming IT will just let you have a decent machines with PCIe slots. It's all about laptops don't you know. Workstations are so 2012.

Secondly while they might, after much begging, let me have one graphics card to put into this one old workstation I've scavenged, they certainly won't let me have a machine with top of line specs with several cards or, heaven forbid, several machines, (but they'll happily let me have a laptop that costs just as much for less than half the performance).