[josephpoon]

It's already infeasible to directly make a single spend of $0.0001 on the blockchain itself (transaction fees are $0.02-$0.05).

[3dfan]

What is the use case of spending $0.0001?

[Taek]

Downloading a webpage, for example. Sending an email, giving someone an upvote, making use of a caching service.

Basically any sort of payment you would want to do at the machine level. If I'm uploading a file to you, I would want you to pay per MB because I'm not sure if you're going to leave after you have 50% of the file.