Earlier quoted context omitted.
That's the other way you get paid in Filecoin, payment channels for retrieving files. Although it's not technically "mining" it's easier to think about Filecoin having two types of miners: Storage and retrieval. Since it's incentivized there's a good chance you'll get your files back quickly if you're willing to pay more or if it's a common file.
As long as Filecoins is traded on a market, and not tied to actual cpu/bandwidth/storage costs, then if will ALWAYS be more expensive then AWS (and alternatives).
Inversely, people could be storing their files for 10x cheaper than on AWS.