A woman asked Picasso to sketch something on a piece of paper.
He does, and says, “That will cost you $10,000”.
Astounded, she said, “You just took five minutes to do the sketch,” she said, “Isn’t $10,000 a lot for five minutes work.
He responded, “The sketch may have taken me five minutes, but the learning took me 30 years”.
Remember that time is money, creativity is money, education is money, expertise is money. The 10,000 hour concept says that in order to become an expert at something, you need 10,000 hours of deliberate practice.
If you’re asking an artist (one who could be regarded as an expert.. no auto-tune!) to do something for free, remember how much work they’ve done to get there and consider if it’s a fair exchange.