Yep, the "green area"
is the house edge, and not all losses were because the pointer landed on those greens.
If a gambler stakes on black and the result is on red, the loss has nothing to do with HE, but because of his
sin.
If a gambler stakes on black and the result is on green, the loss
is because of HE.
If a gambler wannabe afraid of the green area or making wrong prediction, better play
solitaire.
It's a little inaccurate to say that the zeroes of the roulette wheel are the source of the house edge. You must dilute the responsibility across all avenues of the game: the payouts of each specific bet category are such that there is a -1/37 unit expectation (2.7% edge of roulette).
All things being equal, if you were to create an isomorphic transformation to translate roulette numbers into arbitrary symbols,
any particular number can be the one that is excluded from the non-straight-up bets (e.g. even/odd, black/red, 1st dozen/column, etc).
If you were to remove those markets and you simply had the 36:1, 18:1, number-based markets rather than category-based markets, then apart from the variation in splitting chips between 0 and other numbers, all numbers are essentially equal. The house edge is thus derived from the payouts and the game itself.
