I do not think there is anything wrong with a site ocassionally charging for a set when they do have a huge amount of free content. Not all of us have the priviledge of being able to get low cost space with a huge amount of bandwidth. For now my site is fine and will be free downloads and hopefully some people will help out with donations to keep it going for a long time to come
I guess it's a difference in how the term "donation" is used with me. A Paypal donation button is ok with me, I don't have any misgivings at all about donating when I can. However, I don't consider a donation set to fall under that for me. To me that goes over the line to a subscription, although in a small way. If you want the set you must pay for it. That's not a donation in my book. To me that's a paysite. A difference in how words are understood I guess.