Halo was $10 per coin during the ICO. There were only 1 million sold during ICO. They are currently trading around $25-30 per coin OTC on the Halo Discord channel. You can invest in your own Masternode or you can join a shared node. Minimum investment is 10 HALO and your rewards are proportional to your investment. For example, a Tier 1 Masternode is 500 coins. You invest 50 coins. Your rewards would be 10% of the total reward at each payout. Payouts are about once per day. I hope this helps you.