There is no straight forward answer as all cases are different in occupation and locations, I was with a Logistics company whose head office was in Khon Kaen, I had both my visa and work permit within 3 weeks.
I told the 3 people I know who successfully received their invested money back that they wouldn't, only to be proven wrong, i agree chances are less than likely, i am just saying there is hope.
I know of 3 people who have successfully received their invested money back from Thai businesses after seeking legal assistance, all 3 completely different situations, so there is hope. And yes i also know people who have lost their money as well.
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