Oh, ok...I assumed that a fraction like 146:7 was just the actual ratio.
I usually buy stuff I haven't heard - I like the surprise. But sometimes it sucks and I wasted my money...still, worth it for the thrill of something kickass.
I mostly listen to music on my computer (buying/owning the cds is purely a show of support for the music/a bizarre need to own everything), but everything on my computer is a rip of a cd. So I've only heard what I own + what a band puts on myspace or what someone plays for me. Downloading is tempting, but I resist, for some reason...
I know for sure I haven't heard half as much. If it's on metal archives there's a 9/10 chance you'll chime in to tell us that it's not bad, but six other obscure things are better.