Expected-value math for SHA-256 mining: hashrate × network share × block reward minus electricity. Honest numbers only — no guaranteed-profit marketing.
For BitcoinBall (SOLO lottery) the expected revenue above is the long-run average;
a solo home miner usually earns nothing on a given day and rarely wins the whole
block (~3.125 BTC + fees). The product value is the appliance plus the lottery ticket —
treat revenue as indicative, not a promise.