As in the formula DogecoinMachine posted, as well as the faucets investors also pay for referral income. This is the most common reason people cheat with multi-accounts. Self-referring has a far higher potential gain than faucets.
It's very bad for players to commit faucet abuse or referral abuse as you mentioned.
What is worse is when the Crypto-Games.net casino owners steal coins from players for breaking a rule about having two accounts that they were unaware of.
Shame on crypto-coins thieving owners for stealing my 470,000 doge coins.
Warning to all players. Do not support sites that steal from players