Anonymous participant I worked hard fifty years and am not and never was materialistic. My wealth are two part, my good health and my world travels meeting people from different countries and cultures. The difference between my life and the life of rich people is I've met real down to earth ordinary folk, not upper crust types, although I have met a sheikh in Saudi and a multi millionaire in Kensington, from Africa, wasn't impressed with his attitude towards me as I was only a messenger on behalf of the company I was working for and to be fair to him, after I impressed on him that if he had a problem with my company tell them and not verbally abuse me. He did apologise.
Good advice on your initial application for a DTV you only have to show a letter of proof for attending a soft power that is acceptable for the visa application. As far as I know and from a good source you do not have to show how many days, hours, weeks or months you have booked on a course. Once you have the visa and have entered Thailand for 180 days then left & re - entered I suppose it would be upto the IO., whether they can be bothered questioning how long you intend studying whatever.