This topic is so important i have seen mistakes ruin good mmos because of this very topic
a good crafting system can make or break a game runescape and lineage 2 had some of the best crafting systems i have ever seen there is a reason these games did so well there crafting systems definitely played a huge role in their success
ive done all crafts though i may not be as high as some of u in your respective fields i am coming up on all 7 crafting skills being at 10 probably by end of this week not to mention the some 40+ mmo games ive done so ya ive seen plenty of crafting systems
the materials you use shouldn't matter.
the exp u get for the lvl of the final produced item should be what matters and here is why
crafting is not suppose to be designed for making 1000s of a item.
its designed so players can make better gear then you get from dungeons and drops and to build a economy base for the marketplace.
crafting end gear should always and i mean always be best you can get unless the cash shop has better
but with that said that sparks its own debate the pay to win debate.
its pointless to have a crafting system if the final best gear u make can be beat by a in game drop and really by the cash shop as well.
usually if a item costs a lot of materials it usually has some advantage over the other gear like its a rare class for example.
if the end gear isn't made by crafting the market almost always suffers there is 1 exception and runescape and lineage 2 figured it out.
the answer make a much more powerful end gear set that is dropped by the top boss in game and make it very very rare to drop this makes it extremely valuable while keeping crafting alive since its so hard and rare to come by.
for example in runescape the dragon equipment could only be droped by the 4 main bosses of the game you had to kill these bosses 200 times or so to get 1 drop and it took teamwork to win the drop this does have its downfalls eventual through time everyone will get that gear and the market will suffer for it but if made right and followed by better gear within a year it wont hurt the market.
as far as the quests for the professons i honestly think the rewards are a joke i rather not do them and get gold by selling the stuff i make
minor tweaks need to be made on some of the craftable items for example while u shouldn't receive more exp for a item that takes a lot of materials and is the same craft lvl it should be worth a bit more then a item that took less materials to make it now with that said hunted cow can only control the npc pricing but if they do that it will be a start