I know for a fact that the more rewarding way is having a desk (like mine) full of LPs, including every Yes, Zeppelin, Floyd, Marconi, etc. XD
last.fm is just a site/software that registers the songs you listen to and creates a profile, so you can recommend music and meet people with musical taste very like ours.
And nah, Yes is not that rare to see. XD rare would be Harmonium, or even maybe PFM... Il Rovescio, Bacamarte, Campo di Marte... Yes are still world rockstars, just not into mainstream rock today. XD
Also Yes are crap today. XD It all ended with Drama... What a great album. Still they're one of my favorite bands. Close to the Edge is genius.