Yes, it's true. 23 SBCs, a laptop, and a workstation on universe@home. 3 SBCs on tn-grid. A laptop and my phone on WCG. 30 machines total.
BOINC is eating around 600 watts and my mag is about 150. It's about break-even at current prices (given my power cost). The SBCs make a profit, but the laptops and the workstation can't pay for themselves.