Well, the market, for one. All of your non-revenue market effects (discussion with friends, perceived usage, etc) show up as apparent success for a product that you feel is not worth buying. This can help promote purchases of that product and in turn diminish market incentive for the providers to improve on it.
Piracy does not send a clear message to content providers about your opinions of the quality of their content. If you are truly interested in having purchase-worthy content available, finding some financially appealing way of acquiring non-purchase-worthy content only hinders that goal.
Well, the market, for one. All of your non-revenue market effects (discussion with friends, perceived usage, etc) show up as apparent success for a product that you feel is not worth buying. This can help promote purchases of that product and in turn diminish market incentive for the providers to improve on it.
Piracy does not send a clear message to content providers about your opinions of the quality of their content. If you are truly interested in having purchase-worthy content available, finding some financially appealing way of acquiring non-purchase-worthy content only hinders that goal.