Speak for yourself, those are the first two dungeon's I'd pick if this became a thing, which is why its good its not a thing.
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That Game is not World of Warcraft.
How about this for Each One you check off the Rewards and XP get cut by 25% of the Maximum reward. You get 3 Checks. You check one dungeon you lose 25%, Two Dungeons you lose 50% of total reward, and 3 Dungeons you lose 75% of the Maximum reward. This is the Penalty for Stacking the odds in your favor.
If you aren't willing to run every map available in a roulette you shouldn't be queuing it.