I would imagine it's in Thailand's interests to get a 10 year committment from 'wealthy individuals' and that all previous investments would count towards one's required investment........just a matter of changing visas hopefully........................................ Financially, with an upfront fee, the treasury's coffer will benefit too as some expats unfortunately won't out-live or stay the whole the 10 years........................................................
I also imagine the small print would require an updated annual fiscal statement to make sure one isn't flying below the radar having repatriated funds etc which begs the question, how much pain would one be subjected to in submitting that info!!..........................................................