Hell, even the hard drives are gaming, or are making their way there. SCSI was the only way to go, even though SATA overtook the performance long ago.
Even old U320 SCSI drives have seek times ca. 2/3 those (and consequently higher IOPS) of the fastest SATA drives.
Then they started putting 2.5" SAS drives in, which are laptop SATA drives with a bigger pricetag.
You are utterly clueless.
You've only got to hold an enterprise SAS drive and a consumer SATA laptop drive in each hand to know they have to be manufactured differently. Then again, you've probably never actually seen an enterprise SAS drive, let alone held one.
This is before even starting to look at the different specifications - where can I buy a 15k RPM laptop SATA drive ? How am I going to get multiple paths and multiple controllers accessing the disk when SATA doesn't support such a thing ?
The rest of your post is equally misinformed rubbish. I don't know who you build "servers" for, but I pity them. There's a difference between being able to assemble decent server-grade hardware on a budget that precludes big-name vendors, and not understanding what server-grade hardware (or the philosophy behind it) actually is, and you are clearly the latter.