Not only are they paying low, but in some cases they are not paying at all. By now I think most people are starting to abandon ship and find work else where.

Anyone can be scammed, and it doesn't matter if you're smart or stupid because a lot of the times you get scammed from a firm that seems extremely trustworthy. Always be sure to double and triple check whether or not the work you're doing is for a reputable firm or client, and don't be afraid to ask for some money upfront because in most cases employers should have no problem giving you that 50% upfront if YOU are a reputable writer.

You could use payment processors that make all charges final where there is no chargeback option, but that would create an issue with freelancers scamming clients. I personally believe that there is no middle ground and like in every business venture you win some and you lose some. Take your losses with a grain of sand and keep moving forward.

You're right but then the customer feels like he is going to get scammed. Personally I think the best thing you can do as a writer, or employer, is to ask/offer 50% upfront. This gives security to both the writer and the customer.