Fletch,
But apart from how many adults there are on SP, Bruno asked an important question. Before he asked that question, I didn't mind letting the owners decide whether or not to turn their pages "full-wiki" (to make it clear, I don't mind other people editing my pages except for the overview, and selection of pictures). But Bruno's question made me think hard enough to finally be able to formulate my personal answer. And the answer is: I'm afraid that if the owner hits the "public" button for the whole page, the page will no longer be available for someone willing to own it. (You don't need to tell me how the current procedure works - our little, East Central European corner of the SP world has benefited greatly since Bob Sihler introduced it.) What I'm afraid of is that if you ask the Elves to let you own a poor "public" page, instead of getting the page, you'll receive the following message: "This is a public page, which means you can edit it any time you want. We are looking forward to your making the page better."