That´s what I said: the price will be very low - on the flipside the price for storage will be high. Of course, I can´t see the future - my expectation would be as follows:
1.From start on there will be much more space than needed. Few Safecoin would buy you a lot of space.
2. This encourages interested geeks to store files on the network or maybe even screw around with the system.
3. Popularity stagnates at some point, people store faster than new farms are set up. Price per GB rises (Safecoin value goes down).
I don´t expect the whole thing to catch fire quickly. If SAFE provides feasible solutions many people will jump on board, but there will be a natural barrier that is mainstream. So after the entry phase and before SAFE hits mainstream I´d say storage will cost a lot of money so that at some point you might look back and laugh about the guy who bought a Safecoin Pizza for millions. But who knows?
Actually a Ponzi would be:
I take money from you now
I promise you to pay back more tomorrow.
There are crucial differences:
a) the promise is much rather: "I take money from you now and promise to provide safe storage as long as I can."
b) In comparison to a Ponzi you receive something in exchange to your money immediately - even if the system crashes, you received a service before
c) even if there was a collapse, some people will keep the system up for the sake of the idea: “I don´t take money from you neither now not later and I still promise to provide you with safe storage as long as I can”
You can compare it with lifelong plans that some startup products offer to early birds. If the product fails after two years you paid in for nothing. However, if the product keeps up the next 30 years you made a bargain. Also the german retirement benefits work in a comparable way: you pay once you are young and earn money to seniors. Once you retire you receive payments from the then juniors. Currently it undergoes a substantial threat because the birth rate is low for decades and benefits drop. This is critical but doesn´t make it a Ponzi. In the end it´s a contract of solidarity - and not all people are solidly united in the same way.