Is it really worth it to buy Nothing Safe, Essential AiC and Greatest Hits if you own Facelift, Sap, Dirt, Jar of Flies, Tripod, Unplugged, and Music Bank? Some people say "You've gotta have them to complete your AiC collection." Well if you have thoe wouldn't you have basically every song they wrote? Therefore wouldn't your collection be complete? Also, if I didn't buy those, would i be missing any songs i don't already have?