@Graham *****
My sincere apologies for the confusion I have caused. Of course you are correct regarding the VoA. As a side note the handbook does have a section on the VoA as per the previous link I sent. You might have overlooked it as it was a bit further down.
here is the link its no 48
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/48-Public-Handbook-Application-for-E-VOA.pdf
What I meant was the Visa Exemption Scheme which requires 10K THB and an onward travel ticket with a fixed exit date and a Destination other than bordering countries.
However this does not seem to apply to the DTV as it is a multiple entry 5 year Tourist Visa.
Again I would highly appreciate it if you could provide the source of this requirement, which given that you seem to be a SME on the topic, would be easy to provide. Thank you kindly