The USD value of the cumulative revenue Zcash miners have earned is approaching the $1 billion mark according to data from CoinMetrics. Cumulative miner revenue in a network is a metric known as Thermo Cap and is commonly used by on-chain analysts as a gauge of the fiat inflows into a cryptocurrency. The Thermo Cap metric is based on the idea that miners operate slightly above breakeven and the revenue they generate both from block subsidies and fees is a good estimate of their investment into a network’s security. The current cumulative revenue earned by Zcash miners is $994,842,737 according to data from CoinMetrics.
Source: CoinMetrics State of the Network