Both webspaces and webspace pages are webpages, and the names of these , like people`s names and home addresses, help others to find them. If you change their names frequently then people will not be able to find the page so easily. Instead they will get page not found errors, and an unhappy look on their face.
This is also important because search engines will catalog your pages, and people will also bookmark them, and people on other websites will link to your pages.