I need to challenge you a bit on your "under $1,000" comment. How are you defining that?
I need a computer to conduct any of these businesses, and that will likely cost me $1,000. What about the cost of advertising to get customers? The cost of training to understand how to be a website designer, accountant, editor, tech support, digital marketer, etc? There's also an opportunity cost. My time is worth money, therefore should be considered a cost as I start up a new business.
I think these business ideas are great - they all have low barriers for entry, but I don't think any can be successfully deployed for less than $1,000.
Your thoughts?
You can definitely do most of this for under $1,000. Why would you need $1,000 for a PC? A $500 one would work fine and be completely satisfactory for most things, hell I'm on a $300 laptop right now doing this and I've done graphical work on here in the past. Advertising can be doing freelance work and building up a clientele. The training costs might exceed the $1,000 on top of the PC, but most of the stuff can be found online and thus you can access most of it for free.
As for opportunity costs, it's only up to you to start it, and chances are this is in the respect of you having no other form of work to do. Most can probably be relatively easy to start up for $1,000.