I'd like to add to the Treasure Hunting and say that the main focus should be that it gets you tickets for a new Digiegg. It can get you a bunch of other stuff, too, but the draw is that you can get tickets for a brand new Digiegg they would introduce with a bunch of new SP, SP+, and an LR digimon.
And regarding what DigiKaiser said, I thought about something like this. It would be really cool if we could exchange our extra Digimon for Digimon we need/don't have. What I thought of was being able to exchange a Digimon of the same rarity for another. It wouldn't be an equal exchange, however. For example, let's say I want PvG because I didn't get enough in the Halloween Event. I could exchange 3 LR Digimon for 1 LR. Or 3 SP+ for an SP+ I don't have. 3 SP for an SP, etc.
I think having something to do with the Digimon you have extras of would be much more interesting and free up space in your inventory. It'd also be cool if you could trade down as well. For example, two LR for an SP+, or two SP+ for an SP, two SP for a God+. One LR for an SP. One SP+ for a God+.
There are a lot of things you could do with this. Experiment, work it out.