Your opinion on PS2 Promo Disks - Question from a Noob!

[annelaina]

Hey all, just wondering what your opinion is of PS2 Promo Disks ?(pal format). Im getting conflicting info about the value and collect-ability of them, some say worthless, some say rare and valuable - are some formats more desirable? PSp NTSC - What do you think?, do you have them in your collection? Im a noob to this site ( Based in New Zealand ) but have been collecting for ever, have some wicked ps2 and ps3 press kits and 100's of promo disks ;0).