Hmmm I'll double check the menu in the seat next week - I could have sworn those wraps and pizza were priced at $9 - or maybe it was the voucher value that allows you to pre-pay and spend up to $9. If the sandwiches are $7, that's a more reasonable price.

I think YVR is different, but looking at the YYZ signs, they seemed very clear that everyone regardless of their arrival status or connections needed to clear the same immigration checkpoint - after the immigration desk, the signs for US, domestic and international connections pointed in one direction, the exit was the other.

I checked the terminal map online and it does look like you can use a transfer path to avoid the security screening after clearing the immigration check, so that should save some time.

I have never seen a merchant do this ever...except when they post a "pay no sales tax" sale promotion, which just means they are hiding the sales tax in the discounted selling price and paying it for you.