I've seen these guys' ads before... they specialize in upgrading/overpricing/voiding Applecare on minis.
While I admire them for their moxy, anyone who knows Apple knows they are trolling for suckers with bucks.
I've noticed a lot of very good Apple Techs around me are going out of business fast. It is not just the economy. It is that the level of understanding Apple hardware has skyrocketed among normal users.
A few years ago, Apple's warnings about touching their hardware was scary stuff because you were always afraid of voiding the warranty.
Even putting in a new hard drive in an Apple iBook or Powerbook caused a lot of discussion on MR then because it wasn't clear if this would void your overall warranty or not.
I can understand Apple's side in this, they do not want people messing with machines under warranty and breaking them, but the scare factor had an interesting effect: it caused Apple users to get smart and start tinkering with their machines themselves instead of paying Apple Techs to, for example, upgrade a hard drive.
I paid thousands to these techs for dumb thing like that on iBooks, Powerbooks, Minis, Powermacs and iMacs back in the day.
I remember paying a tech 30 dollars to install memory in my iMac G3! (Granted this was when one 512mb stick of Kingston ram was 179 bucks retail!)
Now that I know how easy those types of jobs were, and what fake mystery the Apple Techs conned me with -- I mean -- educating myself was economical.
Only the truly gifted Apple Techs will survive. The ones like these ebay sellers on these mac minis who actually seem to know how to solder logic boards and truly understand the engineering side of things. But even these smart guys will lose if they gouge people, as it seems they are in this auction.
The other thing I heard is that Apple had a campaign a year or so ago with all their third party Apple techs that they got all their customer base emails from them. Apple really doesn't want anyone but their "Geniuses" touching their machines. I feel sorry for the Apple techs today who know how to, for example, solder broken sockets on a logic board and/or know how to overclock within reason and things like that. But not sorry enough to overpay them for this mini. It's a tough business... and they need to be creative to stay alive.