At least for me, I enjoy collecting, grind or not, as long as it's fun (a subjective term, in this case). If it's not fun, I'd prefer it have some sort of worthwhile incentive attached to all that work. For me, it was the rank increase upon reaching 60 cards. I now have much less motivation collecting cards, especially since most of the cards that I don't have I won't be using anyways. If I get any additional cards, hurray. However, until I have a better reason to collect cards, there's plenty of other things that are a much more profitable use of my time. I'm going to assume that some others feel this way, since the mobs of players surrounding the TT NPCs have all but dissappeared.