I've been paying for extra luggage every time I come back. Move important stuff every trip. Far cheaper and not having to deal with border customs bribes, excessive import fees, and "disappearing" shipments. You can get pretty much anything. Depending on your size and if you like certain brands, bring with you as thais are small. I personally have a hard time finding clothes that fit how I like and a couple brands so I bring some stuff with me. Electronics buy here.
after the 1st year it will. But you need to maintain required balance and not let it drop below. You can use the funds but it must be back up a few months before applying for extension. You can use an agent to 'make the funds appear' but that is another discussion. Brandon is very knowledgeable, definitely take his advice.