Businesses are also generally more conservative in future projections and less price sensitive than consumers.
I personally started doing this a few years ago. I even have a throwaway LLC that sounds nebulously like a contractor so I can sign up for "industry only" marketplaces. Since I can usually get wholesale prices doing this, I pay only maybe 30% more than for crap consumer level throwaway stuff.
The major downside is the time it takes, but the upside is that none of my stuff ever breaks.