I want to go point by point.
To whom did they sell? Who buys pirated copyrighted material?
Pirated movie distribute, they sell it through pirated DVD and CD's which are quite cheaper and in trend in under-developed countries. They are very much common in Asian market.
From whom do the people from The Scene get money?
Advertisement. Torrent website link have too many advertisement and even few famous torrent force you to download codec (YiFi), in the case of Yifi print sometimes you need to complete few step before getting codec, which are to download few software, plug-in or add-on etc. Even through YiFi torrent mostly work after the codec but few other also are fake and give Trojan like viruses.
And few don't even want to make money, they just want to make their name.