There are many examples of people from 3rd world countries, who arrive on a plane without any money, as they are planning to work illegally in the destination country, for as long as the visa allows them to. After that they may continue to work illegally on overstay. Look no further than Chantaburi, where hundreds of africans are working in the gemstone business. A business which happens to be exempted from personal income tax and VAT payment in Thailand, in case you have ever wondered, why there are so many foreigners working in this business. Some of them most likely have staffs working here illegally on tourist visa's. You will probably be able to find other seasonal business here, that need workers for a shorter period of time, and happily employ people on tourist visas.