Makes me a bit sad seeing this thread in my favourite OCUK forum, because I go back to the UK in just a few weeks! Still, it's been a cracking 13 months in Thailand, make sure you savour the rest of your time here.
For those interested in doing something like Sin_Chase but worrying about finances, if you do some of the groundwork yourself, like sorting out your accommodation, you can cut down the cost significantly. A lot of the cost depends on how much you want everything to be sorted out for you, as well as geographical factors (Muay Thai somewhere like Phuket which most people have heard of and is full of tourists is going to be more expensive than a less popular destination, particularly one that is not right next to a beach).
It is very possible to live comfortably in the country without breaking the bank. I just did a little accounting and I found that 12.5 months has cost me £3,600, including flights. Muay Thai training needn't add a huge amount more to that. It's a far cry from the £80 a day ol' Seek regales us with!
Keep up the good work Sin_Chase