No new payment on re-entry, many people left/re-entered already and can confirm this. The fee is a one time fee. Another thing is the extension inside the country... not clear yet what exactly will happen about paperwork and price, we have to wait a little bit more. The oldest DTVs are just 102 days old... so... no extensions yet...
You have to show that you have an account with 500,000 Baht (or equivalent), when you apply. Some Embassies are fine if the money is in the account for one day, others ask for one, three or even six month. But... after your application is done nobody will ask you anymore for any money for five years. Maybe, not clear yet, you have to show it again when you apply for an extension. Definitely nobody ask for it when you do a border bounce. So... I saw more than enough posts, where the people shared this money just for application, or borrowed from the parents and so on. That means they not even have this sum by themself. And 500k for five years is not much for living here... that's hardly minimum wage for Thais.
For the retirement visa (3 month) or the 1-year-extension you need to show a monthly income of minimum 65,000 Baht or have to put 800,000 Baht in an Thai account, 50% of this money is actually "lost" because you can't touch it anymore.
We will see how many "quality tourists" DTV will bring...