Omise (a corporation) is building it's own payment network, so that they don't have to rely on expensive, existing systems. Their profit (as a company) will soar the more they drop payment processing costs. Let's assume OmiseGo represents all future payment processing for Omise, and they move off their legacy stack.
https://techcrunch.com/2017/07/05/omise-paysbuy-dtac/
Omise just acquired Paysbuy, which does 2Bn THB (thai bhat) in volume, or ~$60M USD / year.
There are no public records of Omise' payment volume, but we're going to back into it. Paysbuy is the absolute floor of our estimate.
https://docs.google.com/presentation/d/1Bp4KT-W8RF4ZorPUthts8X-B7QHBhsEnY1T5G7XifU0/edit#slide=id.g1421568192_0_11
Google and Temasek released a joint report in May that called Southeast Asia the “world’s fastest growing internet region,” translating into a $200 billion e-commerce market by 2025. Omise is the "Stripe" of SE Asia, and looks set to take a significant portion of the growth. Their roster of clients is pretty sick,
https://medium.com/@jun_omise/the-omise-force-awakens-2015-2016-ef839508a17e
As of June 15, they are signing up 2000 merchants per month.
https://www.omise.co/can-i-get-a-lower-fee-from-omise
Let's assume their growth has been consistent; they now would have ~50,000 merchants. Some merchants have lots of volume, some small. Let's assume each merchant is averaging only ~.1M THB (1/10th of their "better pricing" lowest level), or $3,000/mo; this would be $1.8Bn/yr of total transaction volume, today.
With 10X growth assumptions, they would process $18Bn/yr of transaction volume.
https://www.omise.co/pricing
Omise fees start off at 3.65%. For OmiseGo to make their business profitable, fees have to be less. Let's go super low, and assume 1%.
The token holders, in the aggregate, would be earning $180M/yr. At a fair multiple, this is $25/OMG.