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For example, my office is retiring several Apple Intel Core2Duo iMacs from 2008 and MacBook Airs, and a similar vintage Mac Mini that turned out to be no longer suitable for our purposes.
They are perfectly good Macs for home use, but will no longer run our vertical solution software reliably with the latest OS X (they will run that OS), so we bought some referred replacements. The replacement iMacs with 8GB of RAM and Intel i5s cost us $1059 and we will sell these seven year old iMacs they are replacing for approximately $400 each. . . making the cost of our replacements only $659. If we get the same use out of these new iMacs as we got out of the previous, they will cost us less than $100 a year. That's a bargain, as far as I am concerned. In the meantime, I will not have to buy any business subscription to any anti-virus or anti-malware at all. More savings.
The MacBook Air's, also refurbed cost us $749 and we will sell the two four year old ones also for about $400, which means the new ones will cost us a total of $349. . . giving us a four year potential cost of under $90 per year. Great bargains as far as we are concerned.

Business, lets say Walmart, are not in the business of selling used computers, do you know what they do with their old computers? In most cases they get a recycling company to take them off their hands, they give it away. Walmart isn't going to hire an IT staff to purchase brand new hard drives, open up each iMac, which is a pain in the butt if you ever had to do that, and replace 25,000 hard drives so they can recover a few pennies. 25,000 used iMacs hitting eBay would cause the price to fall as well. Apple hardware is not immune to the market forces of "supply and demand". Just because you did it with a dozen machines, does not mean this will scale to the Enterprise level