Yeah, but typical office PCs are already plenty fast for the things they typically do, so they aren't in need of a big boost. That's why PC manufacturers have been concentrating on making them smaller and cheaper rather than more powerful. It's those data sensitive applications that are atypical of office PCs that are the market for high performance drives.
Besides, if you only need 9.5 GB of unique data per day, you're probably better off upgrading your RAM rather than your hard drive. The stuff you access most will get cached, and you'll have plenty of memory on the odd chance you ever do need to do something that requires a lot.
Typical office PCs at Fortune 500 companies are incredibly sluggish because of the vast suite of security, update, and backup software running on them. The last time I got a new workstation I had a day where I got to use it before it got all of the corporate software. I booted in 20 seconds, loaded office documents in about 1 second, and felt no lag doing typical office computer stuff. With the corporate suite installed I have a 5 minute boot and simple tasks like opening Outlook or a Powerpoint file vary wildly in required duration, with a daily range of 1 second to 30 seconds. Sometimes it will take 5 seconds to show the results of a file search within a single directory.
I have a coworker who just got the new version of the workstation, which is essentially the same but with an SSD, and even with all the corporate stuff it's faster than my workstation was when new.