compatible factory tuners

I am absolutely baffled ! I bought a new 2011 Jeep wrangler with sirius satellite radio already in the vehicle. I bought new speakers, 10" woofers and a new head unit. To my surprise, the satellite tuner is not compatible with my new head unit and I had to purchase another satellite tuner to the tune of 84 dollars (Best Buy). I thought maybe it was just Best Buy tryn to squeeze more money out of me, but I am learning that it is Sirius that has screwed me. If I didnt enjoy satellite radio so much I would tell them to go *^%# themselves. There is no reason for them to not install universal tuners so that they may be used with other head units.