If you're actually studying the visa costs a fraction of that.
And if you're going to stay here long term, you might as well use that money to learn the language.
A volonteer visa (through agents, not legit ones) cost 35-55k and are much better than ED visas, since you don't have to go to immigration and extend the visa every 3 months, like you have to do with an ED visa.
Get on a class 2 train ride from BKK to Kanchanaburi. It's uncomfortable and hot, but it will give you a real Thai feeling and you'll arrive in a historically important city that has a ton of charm and lots of nature to explore. Get a bungalow right on the riverside. You can get on a boat that takes you upstream and then you can float down the river all the way back to your bungalow.
yes, that's what it costs when you're actually volonteering. If you just buy one, you're basically bribing agents and immigration officers to get the visa.