I believe that the demographics has changed more notably in NRL card collecting. Very few if any at all under 17 kids collect full sets of cards barely a team set and maybe a favourite player anymore so it is left to the hobbyist to chase a lot of cards which is very expensive. As previously mentioned, the fun goes out of the hobby when there is way too many inserts and the expense can get out of hand, particularly as an investment, as the market has appeared to dried up.
Card companies can take a lot of the blame, when i see packets for sale at he servo,not a lot sold from the carton i must say,then i know there is a mass production going on, so the inserts can be anywhere.
You also know that most dealers get the good end of the deal so just buying a packet or 2 is really a lottery most times so the investment side of things is really not there anymore as you could buy a whole set of say 1980 for the price of 1 signature card, which is only a card that a player has been paid to sign and numbered to maybe 100 or 500 of only that 1 particular player.
Doesnt make a great deal of sense really!
Just my take on the situation