Thanks for the reply; I honestly am not sure about this situation in particular, I was mostly trying to explain how the statement about marginal costs can be tr

Thanks for the reply; I honestly am not sure about this situation in particular, I was mostly trying to explain how the statement about marginal costs can be true in any scenario. I didn't actually intend to say that the cost here is mainly bandwidth or X for any X. My point is more than it can be true that the marginal cost of anything can be so many orders of magnitude less than the non-marginal cost for certain ranges that it isn't worth considering. Data sets based on facebook profiles almost certainly come from people approving shady apps or someone set up a crawler in a way that is able to get a lot of information before being detected as a crawler. In either of those scenarios, the person who set it up effectively paid a flat upfront cost and ends up with X number of users, and there are no linear costs (no manual verification or paid data entry at any point). They cannot spend half as much time and get X/2 users or even maybe X/100 amount of information. In practice they could spend more time getting more users to give access to their random app, but the marginal cost function is just insanely nonlinear; its effectively 0 at some places and probably tends towards infinity an order of magnitude higher than that.