He fails at MC by saying in a world he has played for TWO WEEKS he hasn't found 8 diamonds....I find more than that in my first hour.....it's all about where to look. The GUI thing probably so it looks a little nicer:D
Gee, thanks. Yeah, it's more that I play for, oh, maybe an hour every few nights when I can scavenge. Most of the time I'm helping my 6 year old daughter build elaborate houses.
On the "multiple diamonds" thing. I think 4 might be too many too. Compared to Equivalent Exchange (I know it's not SMP but still, it's very comparable otherwise) it's a very expensive item. Multipage chests- similarly much cheaper. I think a tiered item would be best. After all, chests aren't an ongoing expense, so long term "balance" is not really very relevant, and tiering would be a better progressive balance solution than massive piles of diamonds.
On the multi-id thing- one word of caution, you may break SMP quite badly if you do that- you'll probably have to re-implement all the automagic code that you're currently leveraging so you can support multiple IDs (can you tell I've been trying to debug multi-page chests which doesn't work properly in SMP because he's homebrewed his own solution).