The huge valuation is almost surely just speculation. I believe it has value in many uses cases but as you point out with point "A" not most use cases. For "B"

The huge valuation is almost surely just speculation. I believe it has value in many uses cases but as you point out with point "A" not most use cases. For "B", the coins are highly divisible and the costs of usage will be driven the market. You probably won't need $1k to use the network, the same way you don't need ~$4500 to use Bitcoin. We're building OpenBazaar on top of IPFS to distribute user's stores. But that relies on people visiting and seeding each others stores. With Filecoin, vendors will be able to pay other users to seed with reliability. Disclosure: We work closely with Protocol Labs but I do not own any Filecoin and don't plan to until it can used for applications like ours.