It's unsense to do it, early retirement visa costs 5800 baht per year( multi re-entry), or even cheaper , if you not use to go out often, 1900 baht plus every time you go out 1000. Why to buy 600.000 baht in advance per 10 years...?
, that i think is not important, as long you could enter in thailand. Forget about it, book a place that includes what requires and good luck and enjoy thailand