Someone can wait more than others do.
I decided to switch from my Pentium III PC with Windows ME
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in spring 2006. I wanted a Mac. An iMac.
Then, rumors about Leopard realease in fall 2006 made me wait.
In fall 2006, Leopard was delayed to may/june 2007.
In spring 2007, Leopard was delayed to october 2007.
I kept my PC for all those months.
In october 2007, I was willing to buy my iMac, but the "freeze" issue scared me.
The day after the "freeze" fix (10.5.1), that is on november 16, 2007, i bought my iMac.
It took a long time, more than expected, but the "value for money" of fall 2007 is obviuosly better than in spring 2006.