Does the financial requirements for the DTV have to consistently remain in your account, or does it just have to be there when they verify?
Basically, can the $ be there during application and approval, then you pull it (for whatever reason), then put it back (to prove you still have it)?
Hope that makes sense.
TLDR : Answer Summary
The financial requirements for the DTV visa do not need to remain in your account after visa approval. Once your visa is approved, you can withdraw the required funds. However, for any future extensions of the DTV visa, you must have the required amount (500k THB) in your account 30 days prior to the extension application.
DTV VISA RESOURCES / SERVICES