Even now we have some bulk synths available, though we can only make up to 3 times the usual amount. With that system, sometimes you get to use slightly less materials (such as only 1 alumen for 3 skins instead of the usual 1 to 1 ratio, or a 9th item gets cut from 3-in-1 3 item synths like bronze bars) but you're only doing 1 synth so you only get the experience for 1 synth. That system could easily be carried over to the new crafting in bulk system, just upping the scale. I think 1 synth's worth of exp for 100 synths is a little overboard but maybe that much exp per 5-10 items? I dunno, balancing goes over my head, but the concept I'm trying to get across should be clear at least.
