I would add that there is psychology at play as well. Someone might scoff at a $200 ticket, thinking it's ridiculous to pay that much, even if you could then eat at the venue for $20.

But they'll pay $100 for a ticket, feeling it's reasonable, and then end spending $120 on concessions and beer anyway. The smells, sights, atmosphere and wanting to "just enjoy it" are compelling forces to reach for your wallet IMHO.

Definitely. There's almost always a strong incentive to move charges as far back into the flow as possible. Knock $5 off your ISP package price, then hit them with a $5 "infrastructure fee" at the credit card screen. For consumers, just because you picked a higher upfront price for a service doesn't mean you'll you won't be nickle-and-dimed later in addition, so it is not trivial to avoid. I guess you can view the "free with ads" model as the most popular implementation: get people in the door and then charge them with their time at crazy rates.