@Rei ****
Do you realise the visa-free entitlement to enter almost any country does not mean you can use it to stay in any country long term or as a resident? You seem to think your Singaporean passport means you can just go move to the USA or France or anywhere else. The point is that people get visas that fit the purpose and length of their intended stay. So if you got such a long stay visa, of course you must make sure immigration officers grant you entry via that visa versus just as a visa-free short term visitor. Also, as others pointed out, almost all DTV visa holders will be from one of the 93 countries (the extremely vast majority of visitors to Thailand) that get visa-exempt entry already to Thailand. Your Singaporean passport is not that special when it comes to entry to Thailand, despite what you think. It's no better than passports from Guatemala, Fiji, Ecuador, Tonga, Uzbekistan, Mongolia, Philippines, Kosovo, Jamaica, Sri Lanka, Jordan, and many other countries that you probably assume your nationality is better than.