If you look at other mass mirror services, they use their landing page for revenue so they can provide the service for free. That's why I suggest you advertise on that page to free users so the service can last long at the same time can also allocate more space / bw to them.2. i don't understand it... you are saying about ads on links page (on reget.it)? I can say this pages are not much popular yet.
Yes, for movie, mp3, etc that's impossible, but most of the uploads will be in .rar files. You may like to deploy method from Rapidleech script or WootScript Advance MD5 Changer. As you said the purpose of your service is to reupload dead links, so without MD5 change it will be impossible for some hostings.c. this problem can be solved by packing with rar or sth else - we cannot directly change md5, i.e. for movie file.
Is the bandwidth returned after 24h or that is all for 1 month - let's say we got 20GB/BW?5. we pay much for traffic. So, we can't upload files to many services for free.
Anyway, hope to get some resolution for this traffic in the future cz it is so little for the uploader to upload even 700MB movie to 15 hosting = 700MB x 15. What if we upload 4GB game???