A 90 days visa exempt entry would put Thailand in the same ballpark as others First Class countries in Asia like Singapore, South Korea, Malaysia, Hong Kong and Japan.
I know Immigration wants the cash but 1,900x2=3,800 to extent currently 30 days in 90 (if that was possible) is nothing compared to the 7% VAT they get on all the Baht that is spent by foreigners and the ongoing multiplier effect of the money entering in the Thai Economy.
7% VAT on 55,000 Baht is 3,800, they're not losing anything, the government would just getting it in other ways.