You keep saying Singapore has unlimited entries to Thailand. So do all the other visa exempt nations/regions like USA, UK, Hong Kong and plenty of others to come to Thailand. Please read the many, many threads in this forum about others being rejected who technically meet all the requirements for entry. It is up to the immigration officer whether they choose to allow you in. It has nothing to do with whether you have a visa from a consulate or are entering visa exempt. It happens all the time. You unfortunately have a lack of understanding of how it works and are trying to argue "by the book" with the rules, which clearly isn't the case for how things work if you read all the posts from people who had similar problems entering the country.

You may have made the same mistake I did the first time I did it: after entering all the people you intend to submit, you need to hit the save button which is on the top right of the web page so that your records for that day are submitted. Until you do, they are not actually sent to immigration.

Your work permit just allows you to work in the country and has nothing to do with the visa required for you to enter or re-enter the country. In order to work, you must possess both a work permit and a Non-B visa. You normally are not asked to show a work permit when you come into the country. They just want to see the visa in your passport. This is because you can have a Non-B visa without having a work permit so one doesn't necessite the other.

Yes, I've gotten a yearlong multi-entry Non-B there every year since 2014 including the last time when it was issued early May of last year. I am the company director and shareholder.

Both your user ID and the initial password are provided in the approval email, and you then change the password to your own.

@Robert ******

OK, thanks for answering.

@Robert ******

Oh wow, I wasn't aware of that. I will certainly look into that. But would there be a reason to go for the investment visa otherwise, if I meet the financial requirements? It doesn't seem like there's much first hand experience with this visa from anyone.

That's what seems unclear, since the BOI website keeps talking about promoting various industries. I wasn't sure if it is limited to certain industries even if you meet the financial requirements.

Yeah but doesn't that require I get a re-entry permit every time I leave the country? That would be impractical for me as, like many foreign business owners, I come in and out of Thailand frequently to monitor my business so often stay only a couple of week at a time, so my passport will fill up from reentry permits very quickly. If I already have the 10MB in a fixed deposit for years now in Thailand and have no intention of using it soon, I was just thinking I could avoid the hassle of getting that Non-B every year if I would already qualify for the investment visa but I wasn't sure if there are other considerations for one versus the other.

@Ahmet ********

You would then be spending 1MB versus earning interest on 10MB and you can't work on the elite visa.