Long drive, Bkk to Nong Khai George, you'd of been better and cheaper to fly to Udon. At Udon Airport there are deals for transport to Laos, or just as I used to do get a bus and stamp out of Nong Khai, stamp into Laos, straight back around the building and back to Nong Khai. Only thing with flying is you have to make time allowance if you book a same day return flight. Best flying from DMK.
I worked internationally for over fifty years and although I never needed any business accounts and I earned quite good salaries, not picking for a few £ or $ of interest a year I would of found it too much trouble to be bothered with. If your referring to tens of thousands of $ ,€, or £ I understand.
From what I gather, if your under 49 years old you need an ED Visa. I believe, but not confirmation from me, that you cannot get an ED Visa if your over 49 years old.
Don't understand why people need multiple bank accounts in any country. I must be missing something. As a well seasoned traveller for over forty years I have ever only had two bank accounts, one in my own country and one in any country I was living in at any one time.
I reckon it's as much to do with how long you spend in Thailand on each visit. If you go for say a couple of weeks only several times in a year, I reckon there'll be no problem, but if you try to go several times and max out visas and visa extensions then you may have issues with IO's. In the good old days I used to go several times a year on visa exempt and do many border bounces. Then after years of this I was at a land border entering and when I presented my passport to the IO., I think he got peed off looking for my last exit stamp as my passport for full of them, so he let me back in for 30 days, but Red stamped me. So after that expired I returned to my own country and got a 12 month O multiple entry visa, which unfortunately I believe is not available now.