I have three. The primary runs at 35 psi for soda and supplies the secondaries. One secondary is set at 12 psi for most beers and one at 2 psi for "real" ales.
Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"
"I would like to die on Mars, just not on impact." Elon Musk