I completely agree....
IF the system is for you or I. I buy refurb all the time and 90% of the time its great.
For instance my GF bought a refurb HP laptop less than a year ago from Newegg. Several months back the HDD croaks and I have to replace it with one of my spares. Not a big deal as I repair PC's on a regular basis, however when trying to procure a replacement I was shot down by HP as since it was a refurb item it only had a 90 day guarantee for parts and labor.
If something breaks do you want her calling you 6 months down the road or do you want her calling Dell? I've recommended, built, and supported PC's for years and in my experience your better off having the OEM support the item fully rather than trying to be the middle man when things happen (and I reiterate, they WILL HAPPEN).
Just my $2c.