Do you get to keep the matched tracks? Let's say you sign up for iTunes match, then you match up all your songs and download the iTunes version. That should be recognized by iCloud, right? So technically you should be able to stop iTunes match (maybe even get partial refund) after using it, then iCloud takes care everything for free, no? That would be really cheap to update all your low bitrate music for $25 one time fee (unless you want lossless).