Honestly, i don't see the point of obsessing like that and trying to get everything, with all the correct signatures etc. I'm not saying you're doing something weird or bad, i do understand it as i'm a big fan too and try to get different shirts and cds. But having a complete-complete collection is something i wouldn't do, it requires too much energy and money. In the end i have to wonder if it's better to spend 100 euros to get some copy of a limited old LP (in unknown condition) or 100 euros to go to a gig or buy a new shirt or a new cd. The first 100 euros will go to someone i don't know, while part of the last 100 euros will go to the band i love and support.