I've heard the saying as "spend good money on what separates you from the ground" - tires, shoes/boots, mattress, etc. In this sense, it'd be "spend good money

I've heard the saying as "spend good money on what separates you from the ground" - tires, shoes/boots, mattress, etc. In this sense, it'd be "spend good money on what separates you from the virtual". That is, of course, our I/O devices :)