Actually this is way more fair that PoW mining.
There are 3. reasons that immediately jump to mind: (please comment if you see any other differences)
1. For PoW mining to be profitable you need scale in order to be competitive. There is also variance on electricity price around the world. Some places you have free electricity if you know the right corrupt people.
2. When you buy a rig, you trust the manufacturer to provide it to you right away without using it themselves first. We would be fools to believe that they don't use the rigs for a little while before sending them off to their customers. This gives an automatic unfair advantage to rig manufacturers.
3. You cannot become a miner if you have say $100 or $1000. You really need a few thousand or 10s of thousands. This goes back to point 1 and 2.

With PoS mining, everyone is on level playing field IF the reward is the same.
We know DASH for example, is not equal reward due to master nodes and they claim to achieve faster tx times due to master nodes.
Anyhow, Bitcoin Plus is actually level and fair across the playing field. Everyone gets 20% mining stake reward per year. You can by 1 coin and get your 20% after some time. Granted it will take you longer to see that reward come in but it will equal out to 20% per year - just like people who hold 100 coins or 10,000 coins will get. The only difference for those who hold more XBC is that they see the reward more frequently, however it equals out to the same 20% per year.

You can invest with 1$ or 1000$ with XBC, you get the same reward until 1,000,000 coins are minted - approx 12 years from now.
After 12 years you will get a proportional % of the fees as "minting" reward. Its not really minting at this point.
Only at this point those with higher balances will get rewarded more.