The only true answer is time. Time = theoretical loss.
You can play a five cent slot machine, and with enough hours get there.
If you walk into the Maharajah club or the President's club at the Taj Mahal you would be surprised at how many low denomination players are there simply because they can bang on those cheap slots all day and all night.

As you must know the average casino in Atlantic City returns approximately 25% of each dollar back to the player in the form of comps.
The pie can be cut many ways. Food comps, limos , show tix, rooms or cash.

Casinos know the money is in slots and that's why tables are disappearing in droves.
If it wasn't for the ruling that CCC has that mandates that the casino must have at least 10% of the floor space reserved for table games, many of the casinos would take them out immediately.

With the advent of machines that issue scrip in payment, more and more jobs are being eliminated.As a result the casinos bottom line improves.

Take a double zero roulette game. House edge 5.26%
how many plays per hour would you figure?
Take the space a roulette table occupies and put in 10 slots that can give you 15 or more plays per miunute and earn you 10% and you know why
most casinos now covet the slot players.