Why can't I print two 5x7 photos on an 8x11 page???

I want to print two 5X7 photos on a single 8X11 sheet of photo paper. I followed the help page info:
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+To print one photo multiple times on a single page+

+Select the photo you want to print.+

+Click the Print button.+

+Select the paper size (such as letter-size or legal-size).+

+Select the print size (such as 2 x 3 or 4 x 6).+

+If you want to make the photo a custom size, select Custom.+

+Click the Customize button.+

+Click the Settings button.+

+Select “Multiple of the same photo per page” from the Photos Per Page pop-up menu.+

+iPhoto will zoom and crop the photo to fit the space available. To make a photo appear full-frame, Control-click the photo and choose “Fit Photo to Frame Size” from the menu that appears.+

+Click OK.+

+Click Print.+
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The problem is that if I select 5x7 as the size, then I choose multiple of the same photo per page, it will only display the photo one time. There is ample room to accomodate two 5x7 photos on an 8x11 sheet of paper, so why is this option not available.

If I reduce the size to 4x6, it will display the photo twice on the page, but even that is not acceptable, since the perimeter boarder of the two photos is substantially larger than the border between the pictures.

One should be able to move the pictures around, similarly to the way we can move pictures around on a Pages sheet.

Am I missing something? Is there some way to do what I want and if not, WHY?