Selling books authored by Salafis
Q:
1. Is it permitted to sell books authored by Salafis? This is specific regard to books on Hadith and Aqeedah.
2. What is the status of the income earned?
3. Is there a difference in selling to Ulama and non-'Ulama?
4. If a person sells Salafi authored books, does this count as a compromise in Usul/Aqeedah?