Why? ( maybe other blogs have this as well,, I dunno)... but as time passed,, I found it useful for each member to have a personal private image folder that only they could access to insert images into their blog, submit content,, anytime they used a WYSIWYG editor.....
The JCE WYSIWYG editor and My Blog were the two components I found that accessed folders based on the community builders member ID number the same way.. so all I needed to do was set the same path in both components,, and then restrict access by user group type and with out a glitch, anytime my members wanted to create , edit submit any content they were confined to that one folder for image and file storage and could not view other members folders.
there other ways of doing this like with .htaccess... but the above method was simple and easy.
but I never believe in promoting one component over another,, download some and try them out and see for yourself