society ticket buying robots have up their game plan minneapolis/st. paul minnesota Internet

I notice this when metallica played US bank stadium and it sold out in minutes but tickets where avilable on-line and up to 4x the orginal price. my brother and i decided to buy tickets on day of show and outside the stadium. we got great seats at $10 above orginal ticket prices.

one day,recently, i visit the xcel box office site and notice seats that were not avilable thur xcel box office or ticketmaster are avilable at countless other ticket sites ,stub hub, ticket king and many more ticket buying sites, had all the good seats and more and at outrages prices. would you pay $190 for upper level seats at a def leppard,poison concert? even the pop concerts tickets are outrages price wise.

I ask you this, how are these ticket selling sites getting all these tickets?