I've so often needed two or three different voltages when working on projects, often just playing around with two different existing components which need different voltages.
Recently bought an inexpensive 0-30 volt variable voltage variable current supply.
To go along with that, I found several different (multiple voltage) supplys at MPJA, each for under $10. I'm going to stack them in a project box (with appropriate mounting of course) with perhaps 8 different banana jacks on the outside, each with a different voltage, with a separate ground for each different supply. Naturally, these days almost anything you find will have a higher current rating on +5 volts, just the way it is.
I just don't always like to reinvent the wheel where there are so many different wheels out there.
Tom