Hi John,
I am not suggesting this applies to you, but I have found (at CiC over the years) that this tends to happen when people don't have a full understanding of photographic principles and/or haven't done thorough enough research regarding what they are coming from and going to.
That is very understandable (in fact almost unavoidable) if it is a first digital camera, or even a first upgrade from P&S.
A lucky few will come here first and/or be ultra-nerdy (like me) and
research thoroughly before going out and spending or ordering, often sight unseen, off the inter-web.
My link there is proof of my attention to detail, but even with a lot of research, there will always be some details that can catch you out, especially between brands; for instance, I am always very pleased with the battery life my D5000 gives me, in comparison, on a day's shooting, my daughter often gets onto her third battery in her Panasonic GH-2 while I am just thinking about changing the first one. Now I helped her research that camera and I didn't see that coming, although it is arguably less important if you have the budget for a couple of spares instead of one, in other respects the GH-2 is just what we/she wanted.
Cheers,