Now we're into matters of convenience and impatience though rather than pleas of poverty. Doesn't quite have the same weight.
It's not about convenience it's about how some of us things should be. Which is that (at the very least scientific) knowledge should be free and open and accessible and we don't see why a private company should be making huge profits (and even worse influence the direction of science) while they are offering almost nothing in return.
But it is. You just have to email the authors and wait a bit.