Precision Desktops:- Technology is slightly less cutting-edge, but more-well vetted (since they are designed for real-work, not playing games). - Use Dell Business Support (often on-site) . Actually, first technician is usually from company IT-Department. Less guessing and shotgun-repairs. For these reasons (and others) I'm sure the warranty expenses incurred by Dell are higher on the Consumer machines. This extra costs is passed onto customers in yearly contact costs. It's like this with appliances, cars, etc.  Think about how many video-cards Dell replaces under warranty because someone is having trouble running a game. Or how many XPS motherboards replaced due to a new (poorly vetted) BIOS release that causes crashes. Since all (or most) actual troubleshooting of Consumer-class machines is by customer, while on the phone with an off-site Dell-rep ... well, good opportunity for things to get missed, mis-diagnosed, misunderstood, etc. 
Why is XPS an Alienware onsite warranties so expensive? A XPS i7 12700 and 3060ti or Alienware Ryzen 500p and 3060ti full onsite 5 yr warranty is about $600. I can build a Precision 3660  i7 1270 and RTX A2000 or T1000 with 5 year pro support for less than XPS or Alienware.   . Specking a Home Office desktop that can do some video and photo editing. Precision pro support warranties are a lot cheaper than for XPS desktops. Can spec a Precision desktop for less than XPS special 3060ti with warranty.
XPS desktop warranty costs vs Precision desktop