I problem is not with the model, but with the photographers. The photographers spoiled the xmms. If said these photographers admit to be merely a gwc, then again so be it.
I rarely pay for a shoot, but if I do, model must deliver to my expectations, and they are very high. If model wants copies of the images from the shoot, I generally do not mind giving web copies. After all, she can download them from my website. However, I have and will caution them, they do not own the copyrights nor usage rights. Any paid shoot, model better prepare to sign full release.
I agree with Octane, the xmms are just spoiled. They think way too highly of themselves. But I blame not the xmms, but the photographers that made these xmms behave as they do.
I also agree with vince. It is not the marginal cost of giving a copy of the soft copies, it's intellectual property and there is a value to it.