Saw him coming.

Keep using 30 days until they stop you. Otherwise no limit. It is more of a problem if you do it back to back without any breaks in the middle. Hence why Oil and Gas workers get away with it on a 28 and 28 or similar.

Like.

Correct 8k AUD or equivalent. Not really ridiculous for staying 6 months or more in Thailand. Works out as 33k a month. If you have the money in the bank it is no big deal. But you also need flight tickets and accommodation details as well.

No it is 300 baht.

When you say a LOT more....is is about another 500 baht or $15 more.....but yes as you said. Go all that way to Vientiane, might as well get a SETV.

Do it yourself, very easy.

People say I am crazy when I say this, but never go to a female IO on arrival to Thailand. The likelihood of them stopping you is much higher than a male officer in my opinion and experience. But as mentioned above, not really worth chancing it all the time, especially when there is no valid reason for you not to get a visa. So quite rightly it looks suspicious to immigration, especially if they are back to back or very close together.

I also don't do 12 hours in a mini van or on a bus. Because screw that. ;)

The best and most comfortable way to do it is to get Thai airways in the night before directly to Vientiane from Suvarnabhumi, stay one night and go in the morning to the consulate. Stay another night and then get your visa then next afternoon and fly out late evening. It is NOT the cheapest by any means, but if you get a decent hotel perhaps with a pool or something it is a nice trip. I sometime value LESS Hassle and running around over saving a bit of money. Vientiane is a sleepy little town, but it has nice little cafes and a nice sunset. If you book ahead you may get a special so it might not be too crazy a price.