In order to be eligible to receive the token rewards, how many tokens do we need to own? Or would any amount be enough to be eligible for token rewards?
There is a tier approach to this. In the whitepaper three were mentioned
If you hold SEEDs bettween 1 to 9999. You are a normal member.
If you hold something between 1000099999 SEED tokens allows you to have priority access to icos.
If you hold more than 100000 SEEDs you can even reserve tokens in an ico.
It's a good incentive to purchase and HODL SEED tokens, 100,000 SEED tokens is quite pricey for the premium membership, I just checked the converter and its value is 18.55 in ETH, and thats based on ETH's current value of $539 on CMC.