[nolok]

A note on this: I do believe the website to be a scam and parent to be obtuse or lying, but for the specific case of your comment studies have proved that people are more likely to stick with the default choice made for them, so you example wouldn't work. Even if the two offers were providing an absolutely identical end value, the default one would have more adoption.

[wtvanhest]

Good point.

The reasonable solution would be to leave it the default option and just make it much more clear what is happening after you buy the shoes.

[jonny_eh]

Or offer 2 equally sized checkout buttons next to each other: "Checkout" and "VIP Checkout"