It seems like recently everybody gets crazy about getting NEO ( Antshares ). But the real coin which will fuel NEO contracts is GAS.
https://coinmarketcap.com/assets/gas/
They have limited supply and if the project success the demand for NEO-GAS could be comparable with Ethereum today. A few days ago the price was in $3 range and today is above $10.
To receive 1 GAS per year you need to hold around 10 NEO in your wallet ( 102 NEO for 1 GAS per Month )
Here is a nice calculator which will tell you how many GAS you will receive by holding NEO in your wallet https://neotogas.com/
Do math your self but I think GAS still might be undervalued if the platform gets a real adoption.