All good as long as it's participants have the adult capacity to consent and do not come to lasting physical or psychological harm. That said, many abuses occur, but more often than not in the context of larger production companies, rather than independent studios / producers where the people involved are, to some degree, familiar with each other outside of 'the shoot' and whose work is held to public accountability.
To that extent:
With online distribution services like clips4sale acting as an infinitely stocked digital video provider for the consumer and distributor for the thousands of independent studios creating media tailored to tastes of *GRANULAR* specification, both the customers, the businesses and the industry all win.
Melding porn into "serious" media or the whole porn as art notion is another debate all into unto itself.
[small] edited in more context to my observation on the changing business model [/small]