I think these volumes are relatively small. Bear in mind that this is tokens, not API calls. Depending on how much input text or output text there is a single call could easily be using 100s of tokens.

Resellers sounds like something that would be explicitly against the terms of service.

Anyone selling access to a GPT-3 based product will be a reseller, strictly speaking.

So, providing no value and simply making money off of less knowledgeable users?

Nah, I hope there won't be any resellers.

well, the value would be allowing other users to purchase smaller amounts.

Maybe I have some hobby app that still sometimes goes over the 100k free tier limit, I might be paying $10/month to get 50k extra but I'm not willing to pay $100 for 2M when I'm never going to use 90% of that.

There is no free tier. You get 100k token that you can use for free and you have 3 months to use them.