lego, after reading your whole post (albiet quickly), I cannot disagree with any point you've made!

Stores did have some rare weapons (rarely, though <img src="/ubbthreads/images/graemlins/tongue.gif" alt="" />). You wouldn't want them to have too rarer stuff or it would make adventuring less rewarding.

Perhaps with the potions, they can start poisoning you after drinking more than one (overdose). Interestingly, Poison Resistance could allow you to drink more potions... Also, I feel that healing/mana potions should have limits, like food. It would be a higher limit than food as they are magical substances and only liquids, but none the less, it isn't really rewarding to win combat by consuming 152 healing potions. Also, I think all potions should replenish you by a percentage and not a flat number. I didn't purchase any Constitution points until the late level 20s because the innumerous Small Healing Potions were sufficient to keep me healthy without wastage.

With the multiplayer aspect, I think that there already is a combined inventory in RiftRunner (not technially multiplayer). The only thing with this idea is that the party would have to play the same game throughout unless there's a suitable party splitting system. Perhaps a trading window could appear with each item valued. The splitting member would be given a credit amount - their fair share of the loot - and could take goods and coins up to that amount. The rest of the party (or perhaps 60% vote) would have to agree on the split. This may become relevent in Divine Divinity 2.

I really like your ideas. Keep them coming!