I think the OP needs to not confuse songs people dont want with songs people perhaps may not know. Ive been buying a few songs from RBN the last two days - certainly more than the last two months.
The reason for this was due to (a) trying to sit on my wallet for the best part to see what was coming compatable with RBN2.0 features and (b) the mass song releases to get tracks out before RBN1 closed it doors meant there was too much for me to get through and pick out songs to my tastes from those which were not and in the end i gave up.
For the best part im now getting back to trying to get through them all and seeing if any are worth the purchase or worse case scenario a demo download. Im hearing a lot of good stuff personally so i guess its different strokes for different folks and being a scotsman its fair to say ive not heard of most pretty much any of the recently released bands but the ones which people claim are bigger names are the ones ive found myself the least attracted too. RBN is an awesome service for the smaller bands and if i like the song enough ill buy it regardless of whether or not many people i know have heard of the song or even the band.