The idea of selling your soul came from the christians. Christians believe that if you sell your soul to Satan/Lucifer; that he will destroy your soul and then take complete control over your whole life which is a misconception. And obviously that was a lie made up by the christian preachers to keep their followers in control. Think about this, those who preach about Lucifer; make up lies about him to be able to keep to church in business. They say “Oh the devil is going to destroy you if you give him your soul!” and that is a complete lie. He does not want our souls. He does not want slaves. What he wants is for people to liberate themselves from god’s dominion but it is all up to those to do so. He will not force them.
When people have said they gave their soul to him, they are desperate enough to think they can get whatever they want from him which he will not let any of that slide. If you know Lucifer, he is not the type to give people whatever they want. If you want it then learn how to earn it yourself. And yes, he will help you but you will have to do most of the work yourself.
What he wants are true followers and true followers to show him respect and honesty. Not people who expect to get whatever they want. There are many people who are completely greedy towards Lucifer, especially when they want to make a pact with him which is exactly the same as selling your soul him. I won’t stop anyone from selling their soul or making a pact with him. Their life and their choice.