> which is the ideal state for a commodity, there is no economic profit.
No. A commodity is simply any kind of good that is considered equivalent no matter who made it. Oil is a commodity, there is plenty of competition and there is still plenty of profit to be made (current crisis excluded)
> While it is very hard to make an economic profit selling grain, many people do farm grain and many enough money.
The analogy here would be to get people to (a) "farm" disks (and electricity/internet) and (b) with some profit to justify their work. (a) is impossible (except for freeloaders) and you agree with me that (b) seems to be unlikely.
So the question is: who would be interested in taking the supply side of the filecoin network, when there is no profit to be made?