Currently, The number of hearts you can give is limited by time I guess. After you've maxed out your hearts within the time limit, you need to wait to recharge love. Each heart is priced at $0.01 for everyone I think. This means $1 buys 100 quality engagement if the crowd-sourced user rating/spam filter works correctly. For $4000/day noise.cash buys 400,000 quality engagements per day. When there is quality engagement at this magnitude, it is easier to get the eyeballs of advertisers. $4000 per day in ad inventory is nothing once noise crosses a certain quality threshold. Kind of Genius.