I am currently not working as a teacher in Bangkok, but what often strikes me is that many people claim that one needs the equivalent of a European salary to live a decent life in Krung Thep.
Besides being of the opinion that one can do with much less than 70,000 per month, teaching a common foreign language while making almost three times what the locals make strikes me as odd. Working for a Thai school and making 70,000 baht a month, good luck with that. The international school route is a much better bet.
I had a blast in Bangkok, made 40-45,000 as a non-native speaker, but packed my bags after almost two years. I miss Thailand everyday, but I think I made the right choice.