Over the last few months I have had a tremendous response to my post about turning off the My Sites functionality it MOSS. You can check it out here.
Anyhow, the reason for this post is the last few comments were people were mainly commenting that it is strange how so many people are trying to turn off this feature. I don't find it strange at all.
My Sites is not a bad feature or one that is needless, it is just that it comes with additional costs. Not in a licensing sense, but in an administration and storage capacity sense. Most of the SharePoint developers realize that each My Site by default has a space quota of 100MB. Now if you times that by the number of employees that you could potentially create a My Site for, then I am sure you will find that is going to be a good chunk of space you need to account for. If you don't plan for this during your inital delivery, then it is better to turn it off than to just let people create My Sites on an adhoc basis.
From the administration point of view it also should be planned out completely so that you have processes in place before you actually turn this feature on.
My Sites is not a bad feature or one that is useless, actually it is definitely a great feature, but as with anything in any software you implement, you need to plan for it accordingly. If your orgainization is not ready to implement it, then turn it off. This would be the main reason I envision most of the people turning off My Sites. Again, not because it is a bad feature, but because they just haven't planned for it yet and will turn in on in the future when they completely flush out the plan for it.
Michael