the lead developer briefly says that the tokens could be used to pay for extra storage space.
Now it makes sense !!!
It is free for everybody for a specific storage lets say 5 GB (dropbox dies after that)
And for extra storage there is a fee payable in safecoins !!!
The purpose here is to make storage free for everyone. Unlimited storage space for all.
But how do we get there? The economic incentives have to take us there. Will it? I think it's highly likely but what if it results in centralization all over again and nothing changes?
Google and Amazon would become the lead farmers, end up with the majority of the Safecoins, and now what? It's a good idea in principle of course and it's a lot more decentralized than what we have now if the code works as intended.
But there is room for improvement. I think we should try to pass suggestions to Dr. Irvine to make these improvements. MaidSafe is incredibly important technology.