In todays adult industry how many sites or rather, how many different types of traffic sources do you think newer webmasters need to have before they start making sales?

I know many moons ago you literally could just throw one site up and within days make a sale but the industry has changed so much over th years.

Has it become more difficult in your eyes to make money from porn surfers an, if so, what do you think the reasons for the difficulties are?

Regards,

Lee