Cost for exclusive content?

[heckubiss]

I would like to start hiring my own models and produce content, however I need to consider the profit margins before paying a model.
for example what is the cost for 3 month exclusive licence of a 30 min HD BJ scene?

do most webmasters buy exclusive content, produce in-house, or purchase old non-exclusive videos/pics

thanks

Warren
SMP-models.com