Lol sounds like someone is jealous. This is a great way to utilize PCs that are otherwise wasting power doing nothing.
Current is delivered upon demand. a 450W PSU doesn't always draw 450W. That's just the max it can deliver under load. 80 workstations running full-tilt for a sustained amount of time will add a noticeable increase on next month's power bill. If you're the one ultimately in control of those 80 machines, all fingers point to you.
I'll still have a job on Monday. You jelly?