Incentives don't exist on a one dimensional scale from pure greed to pure altruism.
People have lots of contextually dependent reasons for storing or sharing information. Those reasons are dynamic and super diverse.
In your case, why would you need lots of people to seed your 100 GB of personal vacation photos? You can seed them just fine! But don't use bittorrent, use the right tool for the job...
As a matter of fact, for the past 4 years I've been using btsync/resilio/syncthing to backup my personal media across different devices, as well as 70GB of audio projects. It's been working great.
That seems like a relatively small scale. And I'll bet some of those photos would be interesting enough to family and friends that they'd seed them.
From my naive perspective, the information itself is much more raw of a "currency" than any abstract economy built on top of it. Its "value" is determined by its relevance to one or many people, and p2p sharing, I believe, has the ability to accommodate this across many scales.
Why did public trackers fail? It wasn't because people didn't want to seed the content, it's because seeding the content became legally dangerous (and the trackers got shut down). To me, that's not a failure of "altruism", it's a failure caused by greed and an inability of industry to adapt.
And also by the reality that the tools are prototype level. Bittorrent and bitcoin are two incredible examples of applied cryptography and network science. They've showed us what's possible, but they're only the tip of the iceberg.
For many applications, lack of commodification is a feature, not a bug. What's holding us back is that the tools aren't built yet, but that's a work in progress!
I think you're missing some context for the motivation of Filecoin. One of the elevator pitches is that it can disrupt cloud storage like Amazon S3.
People do put personal files (e.g. via a cloud backup service) on cloud storage like AWS S3. Instead of a paying a centralized Amazon, Filecoin claims they have a way for money to go to the decentralized owners of harddrives.
Therefore, if "backing up my personal vacation photos" to Amazon S3 is a use case, that means the decentralized peers hosting my uninteresting personal files is also supposed to be possible.
>But don't use bittorrent, use the right tool for the job...
Yes, exactly. That's what my reply to gp was explaining: his suggestion of webtorrent/bittorrent/gun is a protocol that solves a different problem than the one Filecoin tries to solve.
 deep link of Juan Benet of Filecoin mentioning the centralized cloud services: https://youtu.be/6h2WNxEV8q4?t=482
was to sell tokens. Take an existing idea, build an incomplete implementation with a token attached, talk about features that don't exist as if they do - ICO success!