What are the challenges and considerations of using a Multiple Entry Tourist Visa to enter Thailand by land?

A traveler shares their experience at the Poipet border crossing from Cambodia to Thailand, where they faced intense scrutiny while using a Multiple Entry Tourist Visa (METV). Despite meeting financial requirements and having a return flight, they were almost sent back due to regulations that the immigration officer suggested favor air travel over land crossings. Many comments highlighted that the METV might be under increased scrutiny at land borders, with recommendations to obtain the appropriate Non-O visa, especially for those with ties to Thai nationals. The discussion included concerns about inconsistencies and lack of clear guidelines for entry into Thailand, emphasizing the importance of understanding Thailand's visa policies.