How will Agate make profits? Will it be only from fees or there is some other stream of income?
Well POS terminal will also be for sale for merchants using the Agate network too.
Im not sure that will be huge source of income for Agate.It will be mainly from fees,but for that they will need large amount of transactions of course.
There will be different types of fees, not only those from transactions, big partners will probably pay for tech support and similar things.