it's the technicality, there is no 100% guarantee you will be granted the 30 day extension, before it's granted - although we all know it will in all likelihood be granted. Most people buy refundable tickets 🙂
Tina Amer you have to apply for non-o volunteering outside the country...not inside. So once you find an organisation that is prepared to sponsor you, you will need to apply at an Embassy outside the country.
Michael Cantley recent raids in accommodation in Bangkok by immigration looked at whether foreigners had registered their address - so even though they say it's not enforced, you can get caught out later!
Whilst some people will argue any fine is the responsibility of the house owner, in reality the foreigner often ends up paying the fine because immigration won't process 90 day reports, extensions etc until it's paid - and owners regularly refuse to pay!
For nearly 2 years I always lodged TM30 on behalf of owner in Bangkok, and it was accepted no problems.