I do not mind supporting studios or amateur models that charges fees, especially if their content is good. As correctly pointed out, this industry is driven by economics... not by the amount of jizz produced sadly. People need to put food on the table and have bills to pay. Having said that, yes... they are being squeezed by the free producers and the freemiums (combining free and paid services) but the good thing is that there is diversity for the viewers' bank balances.
But nevertheless, I do notice a few things that may contribute to the demise of the industry in certain areas...