I already talked about this with WTP and he said he was on board, so I'm going to bring this up for everyone to discuss.
Basically, we talked about making items like Gems and Herbs (one-use items) permanent. Not permanent as in they remain and keep their effect for a whole battle, but permanent in that they are reusable from battle to battle such as items like Focus Sash or Air Balloon.
Obviously, there would have to be a price hike, but one would figure that buying one reusable Ice Gem for something like $2500 is cheaper and simpler than buying dozens of them for $500 in the long term.
Because of how the Contest section works, it's out of the question for Berries to be made permanent as well. It's possible to split it up between Contest-only Berries and permanent Berries for battle use, but WTP and I both think that's only making things unnecessarily confusing.