My 30 day extension on my 60 day TV has cost me 15000 baht, the cost of changing my original return ticket to cover my extension was 13000 baht.
I normally expect around 5000-6000 baht, but it appears I have picked a busy passenger flight that's the reason given.
Correct me if I am wrong but you can't buy a 90 day return on a 60 day TV, due to having to submit flight confirmation and days staying in Thailand on the visa application.
TLDR : Answer Summary
The discussion revolves around the regulations and practices for obtaining a tourist visa (TV) in Thailand, specifically whether one can purchase a 90-day return ticket when holding a 60-day visa. Several participants share experiences and tips regarding proof of onward travel, mentioning that while some embassies might require a return flight, others accept alternative proof, such as onward bus or train tickets. Suggestions include purchasing cheap onward tickets and experiences with 30-day extensions. It's emphasized that it is unnecessary to have a return flight booked prior to visa application, as most embassies only require proof of leaving Thailand.