We can't trade cards with others so doubles is pointless.
We have limits on cards we can use so "powering up" after a 60 is pointless.
The cost of Gold Triad Card packs is 2160
I just spent 172,800 MGP in an attempt to get a single card without success.
Do I think cards should be handed to players? No, but either the rare rates need to be increased or the return value on the cards needs to be increased.
For gold packs the majority of the time you will get 10 MGP back for a 2160 MGP investment. That's 0.46% return for your cards. I think an acceptable return would be about 10% considering again that WE CAN'T TRADE THESE CARDS WITH ANYONE AND THEY SERVE NO OTHER PURPOSE THAN TO BE A MGP SINK!
MGP sinks are fine but this is abysmal and disheartening for Triple Triad enthusiasts who really want to complete the sets. It shouldn't require the same amount of effort to buy Cloud to get the cards we want from Packs and Dungeons.
Edit: Another potential idea is a card trade counter either with NPCs or PCs but though NPCs. Example. I got a warrior of light in that screenshot but I already have one. Thus it is worthless to me aside from 600 MGP (27% of the pack value...) I could take it to this trade counter and list it up with what I hope to get for it (Zidane). Make it require cards of the same rarity level. IE Plat background card for plat background card. 5 star normal for 5 star normal etc etc.