Mainframes. If you're a bank or an enterprise of a certain size, then a chunk of your annual IT budget goes right to IBM for mainframe maintenance and licensing every year.
IT budgets for large banks and financial firms usually dedicate something like 20% their budget to mainframes, but it usually accounts for about 80% of the firm's workload/processing.
[0]: http://www.economist.com/blogs/schumpeter/2012/09/ibms-mainf... [1]: http://blog.nullspace.io/mainframes.html
After a while, it had the effect of making students getting interested in banking and transaction orientated software engineering, completing the cycle, joining internship programs and maintaining the mainframe paradigm for the next couple of generations.
Wouldn't you? A massive mainframe you can play on as a student, no need for a VM, just log right in!