Steve,
Could you imagine a topic dedicated to TPGs? First thing that comes to mind is the top subject being all the PSA bashing followed by the SGC (now PSA) bashing, followed by pick your TPG bashing. A lot of piling on, I'm sure.
However, it's an interesting thought because their is a direct relationship to vintage card collecting and TPGs.
I'd read that topic if it were available, but then I'd probably be at the top (or near the top) of chuckleheads that lead the bashing of the TPGs.
There could be good discussion about how the board feels about certain topics such as hand cut cards receiving numerical grades. Then there could also be threads about TPG grading specials or discussions on (wait for it) population reports (ralph)

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Interesting (not a bad) idea. If it wound up in the Watercooler Talk section, I'd probably forget it was there.
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