I'v already started buying most of my songs from Amazon where I get DRM free MP3 to begin with. Yah I know, AAC is superior, blah, blah.
And yes, I'm tired of paying for songs I've already bought. I'll probably give in and upgrade to plus, but for me, it's a non-trivial amount $$'s for the large number of AAC/DRM songs I've already bought from iTunes.