But wait, as the whole thing rotates, would not each marshmallow present a different aspect to the fire? Now, admittedly, the side that is presented when closest to the fire would cook most quickly, so this would not result in the perfectly browned marshmallow, but it would not be as ineffective as you implied, and assuming the holder is capable of rotating the whole device every once in a while...
The thing is, as stupid as this may seem, I applaud these companies that spend all this time and energy to bring to market new and bizarre things that no one can think of a use for. Not sure what the numbers are, but some do sell and become perceived as necessities, and it is not easy to tell which.
Now, Brent, I think we need to develop that enahnced marshmallow roaster that would rotate slowly, and while spinning each marshmallow around on its own axis, thereby guaranteeing perfectly browned ("perfectly browned all around!!") marshmallows. If we can combine this with an automatic browning sensor, and an automatic Smore assembler, we would have the perfect $1,000 system no one would ever buy.
Please note, that should any of you wish to go to market with this idea, I will pursue my rights aggressively. Aw heck, why wait? Unless I receive $4 from each reader, my legal counsel will be in touch

.
d
Feeling (south) loopy