I don't think it is +EV when you lose. (In your example, Arsenal won, it wasn't a draw)
Your calculations don't take the probability of landing on a fixed result match neither. (yeah sometimes people cheat)
All I am saying is, you can increase your chances by doing fancy calculations, to an extent but in the end it is still about your luck. +EV is not guaranteed.
Clicking the button however, is %100 +EV, that's why it pays so little.
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It is +EV if you arb laying this result with lower odds, on an exchange bookie, like Betfair. If Admin uses fixed odds (as I suggested before), clonig Pinnacle odds, for example, the total amount of bets woud increase exponencially.
I can totally understand poker and sportsbooks, there are +ev possibilities in those when the time is right, don't get me wrong they are not +ev at every single time or bet, but there are those possibilities at least.
However, dice is rarely ever +ev in any case, maybe if a place is giving a contest or promotion that makes you get more in return of what you wager because they lack other players who wager and you win by luck and by lack of other gamblers but usually even those are not +ev at all.
Dice is a house edged game where nobody wins but the house, you may get lucky once or twice but if you long time enough and wager long enough you will lose all the time. Lottery is not +ev or negative, its between players, there is no house edge because house doesn't win anything.
