There is a diference between Tourist visas and those 30/15 days you get when you show up without a visa. If you do not have a visa most visitors from US/EU get a 30 day stamp when entering at an airport and 15 days if it is a land border so you have to leave Thailand in that period.
Tourist Visa which you get in the Thai embassy back home gives you 60 days and you can extend it for 1 more month at immigration without leaving Thailand.
Also i do not agree you can not get a middle class gf. If you can get one back home i am sure you can find one in Thailand. If you speak some Thai, dress nice and are polite and not fat and ugly you can for sure find a nice normal mid class girl. A nice income helps alot ;)
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