You are lucky to not get sued, because they have ground to sue given the misinformation of your review. Thai laws are very strict regarding defamation. Most school are similar to the one you ran into. You can't compare with University, but what you described is pretty standard (cost wise). For example, the 1.9k baht every 3 months is mandatory.
Which website did you buy the laptop from? Thailand has deals with many websites (including Amazon and Ebay), where they will charge 20-30% for delivery fees which replace the typical import taxes. A lot of people don't notice this upon buying online. So no, a company shipping fee is not only their "own business", it is country specific and based on many things depending on the product.
I am giving accurate and verifiable information. As proof of that, go to Amazon right now and try to buy a Laptop, you will see upon buying that the delivery fee will be 20-30%. So if you buy a 1k USD Laptop, you will get charged $200-300 USD in shipping cost. This is because Thailand have aggreement with such famous website to use shipping cost as taxes. But for websites without such agreement, they will charge you upon delivery. You can try yourself :). This is why electronics is 25-30% more expensive in Thailand.
A lot of good but also factually inaccurate reply. Electronics is 20-30% cheaper overseas compare to Thailand. So when you import electronics, either you will get charge 20-30% for shipping cost (Amazon, Ebay, etc, which will be the import tax equivalent), OR you will pay 20-30% import taxes upon delivery. The delivery man will come to your house to tell you to go to the office to get your package. The high tax is probably to protect Thai companies that sell the same product 20-30% more expensive. If it was so cheap to import electronics, nobody would buy from Thai store.
It's 25-30% taxes, these are facts based on literally everyone who order electronics from overseas 🙂 Ask around how much people pay, they will all say either 25-30% shipping deliveries (pre-tax cover, on Amazon or Ebay for example) or 25-30% upon delivery. The 25-30% is to protect local Thai businesses which sell the same electronic 25-30% more expensive.
That's absolutely not true. You will pay 25-30% overall taxes combine when you buy electronics overseas to cover the fact that the same electronic will be 25-30% higher in Thailand. Either you pay such taxes when buying the electronics or went receiving it.
The 180 days thing is indeed not a law, but you incorrectly pointed out that it was "debunked", which is not true. What is debunked is that it's a law (it's not), but at BKK airport, officers will sometime give the 180 days reason to try to deny you, but then will write something else in Thai as tho why they denied you entry. It's a ploy on their part and foreigners who can't read Thai get suck up into it. Again, being precise matter because anyone in that airport could get caught thinking that the officer was right in telling them that crap.