The only problem is that a board on edge (especially a wide one) will tip over at the slightest bump. And when one board goes, they all go over -- just like row of dominoes.
To prevent this from happening, I clip a spring clamp on one end of each board. The spring clamps the board up above the pipe, and the handle serves as a stand.
You can get more woodworking tips and techniques from Woodsmith delivered to your computer each week. Here's the sign-up.