I have the same issue with a lack of electrical outlets in a new home (Where I come from there's a code that for every 8 feet of wall there needs to be an outlet). I just "bit the bullet" and hired an electrician to install more, as it's horrifically unsafe to use extension cords for some applications.
It's not a VOA, but Visa exempt. Your airline might, or might not, require you to have proof of your leaving Thailand within the 60 days as I've heard. I've personally never been asked for that proof but haven't tried to enter Thailand for almost 2 years, and they may be a bit more strict about it now.
if you get in a bad accident whilst in Thailand, you probably won't be able to work, right? So they need for you to be able to pay your hospital bills before you leave the hospital. Need proof of being able to care for yourself.