The OMG token is first and foremost a staking token. By holding OMG tokens, users gain the right to take an active role by running validator nodes on OMG’s Proof of Stake network, using their tokens as a security deposit. Returns may be paid out in any currency, including but not limited to OMG. Read more on staking OMG here and here.
OMG will be a conduit for bringing value to Ethereum mainnet, because the value of OMG will be backed by the value of the amounts transacted on the OMG network; both external, real-world money, and crypto-money that is being pushed through the network’s decentralized exchange (including the other applications, businesses, and token projects that are outsourcing their DEX requirements to it). As the OMG platform and underlying network develops and evolves over time, so does the nature and role of the OMG token.