I work offshore. This is what I posted elsewhere, might be useful to you.
Applied online which was sent to London for approval due to home location being UK.
Applied on 19th (Friday), on 23rd (Tuesday) got the request for addition documents (proof of employment) even though submitted my employment contract which was issued through Singapore. They requested a letter from UK or Ireland employer.
Reached out to HR, got the letter, submitted it about 12 hours from the Thai authorities requesting for it.
Even though the letter had no UK nor any other country mentioned anywhere at all (I work for American company), just stated that I am international roamer with no fixed place of work.
That worked well and on 24th (Wednesday) at 22.59 UK time already got 5 year visa approved. So basically 3 full business days taking into consideration that they were waiting for nearly a day for the letter of employment.
Application process is easy but nit-noy confusing, one of the requirements was proof of current location. By that they probably mean "proof of address", but to be on a safe side I supplied proof of current location - which was my boarding passes to Spain from previous day + missing baggage reports with dates as well as my gas bill as proof of address.
Supplied Bank Statement from UK bank with current balance which was more than 500k Baht required.
Visa valid for 5 years from the date of issue (24th). So next time I fly back home to Thailand I will no longer have to go through the visa-waiver and perhaps can consider buying a car & motorbike if it is allowed with this visa, need to investigate further.
Easy peasy!
Total cost £300, so not really 10k Baht as advertised, but maybe different fees for different countries, overpaid by 4000 baht, but at least done and dusted.