The problem is rarely the monetary costs alone it's more about the need for handling an one-off situation that require special policies, and becomes an special item on the budget.

For large companies supplying VDI to consultants tend to be an standardized package that gets billed back to whatever project is hiring the consultants but for mid-sized organisation VDI is a big scary word that's going to require special handling.

Most desktop support teams are completely dependent on standardization to the point where they tend to turn into complete control freaks, that panic at the thought of anything that is not "by the book", so they often just apply the book without additional budgets to external consultants.

I am not interested in politics or humans when the problem is a technical one, i understand you but that's my stand ;)