if they have to make a plug, theyre almost certainly losing money on six. if theyre doing a straight-up clone from a different part, then its probably a couple less. 6 is reasonable, it splits the difference. sending extra deposits wont help unless youre gonna buy the extra sets. which, if you guys REALLY want these, is always an option. you dont have to keep all of them once theyre made... but its a risk and is up to you.because they need to be able to use the mold a certian number of times before they can recover the costs incurred in making it to begin with. Honestly with labor factored in (and this is just a rough guess), even at a sale of 6 my bet is they're losing money on the mold.