I should clarify...no intention of being condescending. For some people it is a simple matter of affording the extra $149... that much money makes a huge difference in some people's budgets - enough so that they wouldn't be able to upgrade the RAM or the HDD if they bought the faster processor. For others, it's whether the value is apparent to them for how they'll use the computer, regardless of cost. And for others, even if the value isn't large, just having a bit of a bump in processor speed is what they desire. I totally agree that for certain applications, there's very little top gain by upgrading to the 2.26.
I tend to tax my systems somewhat with lots of multi-processing, many open apps, large photoshop files, burning discs while running photoshop filters on large files, etc. Much of this taxation is directly addressed with memory and having at least 4GB is extremely important to me, which makes the biggest difference, followed by quicker drives, which helps as I am constantly opening and closing numerous image files which range from 36MB to 250MB or so. But some of my use is processor intensive and I appreciate having the quickest processor I can get with the mini and, for me personally, the value is there.