1 - where are you selling?
2 - can the local economy support said magic item/trinket?
3 - worried about where the next Psi-stalker is gonna come calling?
otherwise you have to think of it in the following way. i had a char that could create magic potions.
sadly there is NO place to sell them .. yet.
not only that, but i had no clear idea how much to even charge, and then i thought of it this way ... 10K per spell level ... [2 are needed]
thus for HER to make a potion that could render someone .. say .. invisible [invisibility: simple] ... it would cast the person *tallies up the info*
80K + 30K for the spell .. for a total of 110K .. for a 1 ounce bottle of potent potion.
thus .. not many WOULD be interested in buying it .. other than for perhaps a 'novelty item' .. for the rich and powerful uber-characters
so .. its up to you how you want to think of it.
forgot something ... that price is what a BATCH of the potion would cost her to manufacture. i would have to roll to see how many actually came into creation .. and would actually divide the total by that amount.
so if i maxed the roll .. that 110K / 5 = 22K an ounce
so i guess its all relative