No. While there is a subset of good advice which is only valuable because a lot of people don't follow it, that's not a property of good advice in general.
For instance, "Eat healthy food" is good advice, and doesn't become less good even if everyone began following it.
Marketing advice, though, is probably more susceptible to "becoming bad," since it typically depends on making your product stand out. Thus, as more people follow a bit of advice on how to stand out, the less this advice actually helps them stand out.
For instance, "Eat healthy food" is good advice, and doesn't become less good even if everyone began following it.
Marketing advice, though, is probably more susceptible to "becoming bad," since it typically depends on making your product stand out. Thus, as more people follow a bit of advice on how to stand out, the less this advice actually helps them stand out.