it is worse in our so called 'free space' (Europe). Without proof of 55 Euro a day or someone to guarantee for you you won't get a Shengen visa (90 euro). We can at least walk into Thailand for free for 60 days... and a 30 day extention is only 1900 Baht. Again no money-proof asked... Lodging yes (TM30).
I travelled into Thailand three times last year. I was never asked for proof of funding or an amount of cash (I didn't even bring any)... And also not asked about proof of a return/onward ticket.
Don't be a tight-arse, just enjoy your entry/trip in Thailand 😄