To make money and advertise your country to the rest of the world.
They spend money.
I believe the United States has the most out-going tourists.
Those countries' airports are always jammed with tourists.
Depends where you are visiting from. From some countries you don't need a visa to get in if you are going for the regular amount of time slotted for 'tourists' (which might be three months).
Every country except for yours.
u.s.
Countries around the world. LOL
The USA
Except of Than 10 countries, including Colombia, Somalia, America, Britain, Canada, Bangladesh, Jordan, Iraq, Afghanistan and Pakistan as well as tourists from other countries will need a visa or a visa at the airport for them to be exported.
Not very developped: - 1 275 590 tourists from other countries in 2009 - 4 865 545 Romanian tourists
They mug and assault tourists and are responsible for 15% of the countries stabbings
they could go and seek other countries