The only place SCSI is marginally useful is in RAID systems on your server, and even there it's only cost effective if you are running a system with thousands of users.A pretty bold claim to make.
No, you're not magically going to burn a sincle CD faster with a SCSI drive. But using speed as the only rationale is not looking at the whole picture. It's sort of like saying that the dual 600MHz Origin server is less worthwhile than my PC, because my PC crunches numbers faster and is cheaper.
If the extra $100 I pay for a SCSI drive means that I will enjoy never having to replace the drive; never having to deal with a software compatibility hassle; never having to deal with an interoperability hassle with another device in my loaded system; and never having less than the best performance that I expect from the equipment, then that's an extra fee that I will be happy to pay and not look back.
The choice is up to the individual, but all these people bemoaning those who have preferred, and still prefer, SCSI drives is sort of ridiculous. Isn't a diverse marketplace supposed to be a good thing?