Why do Single Entry and Multiple Entry Tourist Visas in Thailand have different financial requirements despite similar durations?

You're trying to figure the Thai Government. Sanity will be a hindrance in that endeavor.

But the one thing is "Multiple Entry Visa: You can stay 60 days + 30 days"

Is actually times 3,

"Multiple Entry Visa: You can stay (60 days + 30 days) [x 3] "

You get 270 days which is 740 bt a day. 740 = 21.00 US +/-. $20 a day to live off of isn't much, even in Thailand.

so fewer folks have the financial resources, to obtain the nicer one, and go for “TR- S (Single Entry)” VISA, as easier to obtain for some folks, and fooling around longer, with a faster spending rate perhaps - I have a suspicion, NO/less longer-timer, please, spend your money and go back home

Somebody left off a 'Zero' they don't tidy up small mistakes like typo's here on websites and such.

Secondly, you don't have to spend the money required to obtain a visa, just have proof of those funds. So no point in including that in your daily visa cost calculations.

If you look for the most cost efficient option, well the right visa for the purpose of your stay, is probably the cheapest.

If you want to stay 60 days, a Single Entry Tourist Visa is cheaper then a free Visa Exempt & extension.

If you want to stay longer then 90 days, a Multiple Entry Tourist Visa is cheaper then 1 Single Entry Visa & extension.

If you want to stay a year, a NON-Immigrant Visa is more economical then several Tourist Visas and extensions.

First of all the Visa and the Extension of stay are two different things.

Visas are the responsibility of the Foreign Ministry whilst Extension of stay are Ministry of the interior.

So ...

Visa Exempt only gives you 30 days.. ( with extension up to 60 days)

Single Entry Tourist Visa gives you 60 days (with extension up to 90 days)

METV gives you up to 180 days. (With extension 210 days)

Extension of stay is always 1'900THB ( I believe it just increased to 2"000THB but not sure) nevermind if it's a 14, 30 or 360 days extension.

You shouldn't be in Thailand if you don't have 200k baht as pocket change in your bank account.

Your mistake is applying "common sense and logic" with anything to do with thai bureaucracy. The rules are the rules and generally never ever make sense..

It's 60 days not 90 for the single entry TR visa. If you're going to add on extentions then you can get up to 270 days from the multi-entry TR visa.

You are reading it wrong, single entry has a absolute max of 90 days. Multiple entry one has a potential for 270 days. So it’s 90 days vs 270 days.

On a METV if you re-enter Thailand on the day the visa validity expires, you get another 60 +30 days. So basically METV has potential for 9 months.

TIT There will be a logic there somewhere in some senior civil servants thinking.

This is what happens when top places at embassies are given to people based upon who they know not on there educational abilities or experience.

Many of us have already learned "why" is a waste of energy.

DO or DO NOT there is no "why"

Wrong country, if you are looking for reasonable explanations in matters of bureaucracy. Either play their game, or beat them at their own game. If the obstacles get too much: find away around them - there usually is.

It's not worth worrying about.

Because the embassy said so

Because that's what the embassy wants. It's that simple.

Every embassy makes their own rules and they're often different from embassy to embassy even in the same country.