Q1. How can we measure the network capacity?
Q2. When network is actively used and I own a small portion of BTS, how much I have to pay to transfer or order creation?
1) ATM there is a cap on 100 tps. That could probably be considered the network capacity atm.
2) In theory you are always allowed to use your allocated "bandwidth". Even if everyone is using all their allowed cut, you would still be able to use your own, since it is kind of "reserved" for you.
You should also consider that it would be very difficult that all the shareholders will be using the network as much as they can, in the exactly same time.
Moreover there are algorithms that could give you* priority over others**
*you as user asking for a low-normal usage of the network
**others as users using all the bandwidth they can use
(maybe depending on coindays earned)
Anyway, if we want to allow an user to allocate more than what he have right on (based on his % bts owning), we should charge a fee for it. The amount of that fee would be decided exactly as all the current fees are (shareholders/committee)