"And? Just as I don't value a 1/3 chance of winning an apple at 1/3 of an apple's value, I don't value a 512-in-19683 chance of ending up paying you zero apples at around 1/38th the value of paying you zero apples. Why, I value it at around 9/10th the value of paying you zero apples with surety! As for all those other outcomes where I end up paying you one, two, or even nine apples, I value all of those put together with the remaining 1/10th of the weight that I put on things, when I weigh possibilities."
"If I haven't started out by already accepting that chances of things happening, ought to be weighted proportional to their probability, then when I look at all the things that might probably happen when you ask to buy four 1/2 chances of winning an apple from me, I don't have to value the 1/16th chance of paying you zero apples at 1/16th the value I put on that outcome."
"In other words, you're trying to convince me to accept that principle using an argument that only works on people who've already accepted it."