Quote Originally Posted by Unoriginal View Post
...Why would anyone accept to be payed one gp a day, which is half the salary of a skilled hireling, when they make as much money working once per month, and they can work several time by months?

A 1rst level spell slot is worth 10-50 gp. If you went to a mage and said "I want you to use all your 1rst level spell slots to build magic items for me, in exchange of 1 go each day, but I promise you'll have regular work."

You can't say "I choose to keep the numbers small" when keeping them small doesn't make sense.
If demand is for less than one 1st level spell (for 10-50gp) every 10-50 days per caster trying to sell their spells, it does make sense.