Our current crop of work visas are are more for the purposes of statism and not market friendly, or we would not have issues with black market migrant labor participation.
At-will employment doctrine suggests that there is no guaranteed employment, in states that have at-will employment laws. Guaranteed employment is also not market friendly, since it does not allow for changing market conditions.
Any tourism would be incidental to the legal right to work in our form of statism.

