Are you in a position where you can convert your time to money freely as-desired?
I expect that people on Less Wrong are demographically more likely than most to be able to do this, but most people have jobs which take up a certain amount of their time, beyond which they are not at liberty to convert more time into more money at a comparable rate should they so choose. So time/money tradeoffs which fail to account for whether the time being traded off is actually employment time, and thus valuable at that rate, will tend to be misleading.
Are you in a position where you can convert your time to money freely as-desired?
I expect that people on Less Wrong are demographically more likely than most to be able to do this, but most people have jobs which take up a certain amount of their time, beyond which they are not at liberty to convert more time into more money at a comparable rate should they so choose. So time/money tradeoffs which fail to account for whether the time being traded off is actually employment time, and thus valuable at that rate, will tend to be misleading.
Edit: I missed the fact that gjm has already noted this in another comment.