Wait, so you're saying Drobo is the ONLY electronic device out there that ever fails???
If you're saying that a Drobo fails more often then a standard RAID system, then you need to provide some statistics to back up that claim. Otherwise, you've mentioned a worthless point: anything can fail.
A Drobo isn't the be-all, end-all to data storage and backup. A Drobo is just one aspect of proper data management and isn't meant to be a 100% fail-proof devise.
The point is that when Drobo's fail, due to the proprietary storage and poor support, you are often left with little to no recoverable data and little to no help from support.
I've had this happen twice after a brief flicker of the power in my house. All my other external FW hard drives were fine. The Drobo? Lost. Couldn't read the library/directory structure. Called support and was told to spend another $100 to buy Disk Warrior.
All the data stored on my two $30 FW enclosures from ebay were fine. data on my Mac was fine. Only the Drobo lost data.
Sold the Drobo as soon as I could...