You want to go to an event at a venue controlled by ticket master. You go to the venue website and look at tickets and see you can get the ticket you want for $50. Sounds great. You click it, you are asked to create an account and put in your name, address, email, phone number, maybe some other information. You are then asked to check a box saying you agree to 65 pages of dense legal jargon which is spread across 4 different documents, 2 of them on 3rd parties sites. You check the box without reading it because you only have 11 minutes left before your hold on the seat you choose expires and lets be real 99.999999999999999% of the public is never going to even skim the legal bs. Finally you get to the shopping cart. The price is now $149.73 from fees, plus your local sales tax if applicable. If you knew it was going to cost $165 up front you might not have bothered, but well you already jumped through all those hoops so maybe just this once its ok. Maybe you do walk away but you've already "agreed" that ticketmaster and the venue can share or sell your personal information that you entered in step 2 with anyone they want so either way they come out ahead.
Thats the issue with ticketmaster's current business practices, and a lot of other US companies.