In fiqh, the religious director or an Islamic centre, or the Imām of the mosque is referred to as Imām al-Rātib, and his role is important in managing the religious affairs of the mosque. He can receive a regular income for his various services, like lectures, counseling, religious management, etc.
It is problematic for the religious scholar to receive any financial benefit from doing something wajib or teaching something wajib, and even for jamā'ah prayer itself. It is not befitting for talib al-'ilm to be paid for leading prayers in itself, but he can receive salary for the preliminaries for these things, like travelling expenses, rent, and so on.
Indeed, the more financially stable the religious scholar is the more effective he will be in serving his community.
And Allah knows best.
Yes it is permissible to receive salary for the time and efforts he gives in teaching, guiding and helping people.
Masjid Namirah is a well known Masjid in Arafat area. It is mentioned that this Masjid was built on the place were the Prophet Muhammad (SAWA) gave his famous sermon in Arafah when he performed Hajj on the year 10 after Hijra which is called Hajjatul Wadaa' (The Welfare Hajj).
Masjid Namirah is important for the followers of Ahlul Bayt (AS) as it is one of the places where the Prophet (SAWA) visited and gave a sermon. The Prophet (SAWA) prayed Dhuhr and Asr prayers together. All Muslims admit and accept this fact. No one can claim the the Prophet prayed Asr before its time. It means hat he tme of As starts immediately after performing Dhuhr Prayer.
Till now, all Muslims pray Dhuhr and Asr together in Arafah. This Prophetic worship itself is another evidence that what Shi'a Muslims practice is completely authentic and it is from the Prophet Muhammad (SAWA).