For those there to gamble it should be provably fair and house edge. Everything else, while nice, their absence could mean the house could afford a lower edge.

However, for the casino, having things like faucet and affiliate program can increase their player count. This is important, since people are far less likely to play at an empty casino. You'd take a loss from those programs, but make it up by attracting more big bettors; feed the little fish in order to catch the whales.