There's a few places where these comparisons break down. First, there is a difference between being away from home and being away from home while being on site

There's a few places where these comparisons break down. First, there is a difference between being away from home and being away from home while being on site 24/7. I'm pretty sure the business traveler and the majority of farm workers don't fit into the latter category. Those who do, such as people working in remote parts of the world, are usually paid quite handsomely. Second is the level of compensation being provided. Even if you could earn $1,400/week every week of the year as a farm hand, which you cannot since it is seasonal work, you would still be earning less than most people who have to travel for business on a frequent basis. In other words, certain people have their pay padded to account for working away from home. Finally, there are a whole host of other differences. To a certain degree, these laborers are considered replaceable. (They may not have lost their jobs, but they have lost hours.) The hours worked are rarely guaranteed, particularly if their role is tied to production (rather than maintenance). And if they do have a job outside of the farm, they're going to have far less flexibility to pick up extra hours even when the pay is better (not everyone is a migrant worker or a student).