This mentality is pretty much why comics are worthless from that period. It used to be that comics were valuable because they had a compelling story or marked a turning point in the various comic universe; not because they came with a limited edition, cover, card, poster, pin back, etc.
My suggestion is to use all comics from the 90's as kitty litter and only buy and collect comics that have some intrinsic value and not because they are destined to be financial investments.