My usual policy on 2* and 3* crafts is "want something? Grab me the philo/myth mats and I'll make it for ya." If it's someone I know I'll usually do it for free if they get me, say, the 9 coke I need to make a darksteel haubergeon. Otherwise I'll charge probably 10-15k, maybe 20-25k for a 3* item, as I'd be getting all the other stuff myself (including things like scarlet sap). I'm a little surprised at the idea of requesting the crystals used though, but maybe that's because I'm a 2* botanist and I can get those things really easily. It's usually very few crystals for a craft after all, even a Vanya item only takes 12 wind crystals (for the twinthread) and then a couple of clusters.