Proceed with caution... People have been fired for running BOINC / Seti@Home on work computers.
http://news.cnet.com/8301-10784_3-5406158-7.html
http://www.geek.com/news/setihome-god-fired-for-costing-school-district-1-6-million-1004362/
In those cases, the people weren't profiting - I suspect the consequences could be even higher if you are putting software on them to make $$$.
There are other examples - those are just the first two I found. And yes, they were not very smart about it. At very least, make sure the powers that be know what you are up to - it's nice to have extra coinage, but probably not worth risking a career over.