In today's world, if you want to be successful in business you need to learn how to take advantage of stupid people. If you don't your competitors will and leave you with no business. Big numbers echo in the heads of stupid people, this is a well known fact.
When I installed Linux Mint Cinnamon I enabled auto login only to find out later that if you do the computer not automatically connect to network shares and you'll have to input both passwords before you're connected. This is profanely stupid but not as stupid as a total lack og information as...
"cheaply" may be problematic. Buying that many HD's is bound to get you more bad ones than you'd care to deal with unless you can insure they are pretested. Most seller use stupid terms like "great shape", "excellent", "tested", etc. which mean absolutely nothing.
I keep seeing these pop up on eBay and people are actually biding on them. No way would I ever buy one but can't help wonder why people do.