Let's assume the data in the article is perfectly representative, or that it is chosen "almost 18" percent of the time. I'll say an even 18 to make this easier:

"I'll bet that if you pick any random number from 1 to 20, I can guess it. If I miss, I give you a dollar. If I get it right, you give me ten."

Over 100 trials, you would lose $1 92 times, but gain $10 18 times: net gain of $88. It works almost all the way down to getting $5 per correct guess.

Intuition would tell the guesser that they've got a nineteen-to-one chance of gaining a dollar. You know (in theory) they've got only slightly better than a one-in-five chance of winning.