Well depending on where you are gmat
Here in canada, even taking into account that i already have the scsi controller and the raid controller, it is still way more costly to run scsi drives. One seagate cheetah X15 is still 378$ for the 18g version (second gen) compared to around 159$ for one 60g 7200rpm.
If you have the money to go scsi, cool, that's great, but i don't and there are many who don't too. So IDE raid is still a good solution before going SCSI.
Also i'm really sure that many looking at this site don't have the money to buy SCSI drives, so maybe you could tell me where to look so I find all of those who have scsi
If BB2K has the money to go SCSI, then do it, if not, then serial ata (which solves many problem of the current ata standard) is a good solution.
Oh and by the way, i do agree that scsi is better, it's simply that there are alternative that are cheaper that might be able to do the required task.