if you say so, but I disagree from my own personal experence. My wife and I both have Dtac, she paid double at BKK then I did 2 days later at a Dtac store.
I would suggest getting a sim from a proper store outside the airport because well you get airport prices, but if you don't mind paying price it's the way to go! You can just download the providers app and recharge your data whenever you want. It's pretty simple.
Honestly it is doable. I am 42, my wife is 38, we have been living here for almost a year now. We all have views about money but really it is all about how you choose to live and what is important to you. We are speanding between 2000 to 2500 a month and we are living a good life. Just come here, find an area that works for you. As for a visa, the DTV is your best deal at the moment
I would say that depends. My wife and I got ours from Canada and the process of applying on-line was very easy and quick. I have read and heard from others that the process in each country is a little different much like the price. You will also need to show up in person and leave your passport. So it really depends on how much effort your willing to put in to save the money and take the risk of not having all the documents they will require.