Hive doesn't require people to buy coins to participate. Buying coins to participate in governance or rewards distribution is just an option for those who would like to invest in the network. Anybody can use the network without spending a dime.
Well, I kinda disagree with you at this point. I, an ex @cityofstars member, who just started sharing thoughts using @k2x account who has 0 tokens almost wasn't able to do anything. I was following people that I like reading their articles. at the middle of that, I couldn't do anything due to lack of RC. Thanks for @thehive who got my back. So, in terms of participation in the network to do usual things. small amount (small investment) of hive is required.
Overall, Nice article and thank you for sharing :)
RE: Chamath Palihapitiya and Mark Cuban Revealed Their Criteria For Social Network in Crypto