Lol, I voted no.
The idea lacks, you may consider it to have a viable point, but I don't really see it.
I mean, if you could come up with a reasonable test; simple, but effective I could see it happening, but the test would not do much. Most people that make these kinds of errors are just laid back, not paying much attention, and trying to buy/sell their items asap.
Not to mention the fact that it would be unfair to add something like that in, just because they can be a little bit illiterate and fail to pay attention.
Everyone makes mistakes. If you want them to pay attention, you could always instead of writing bump you could do "Still looking for exact iso, please pay attention to it." and I suppose you can report their posts, since all they are doing is Early bumping you.
Good luck on your suggestion though.