Muslim Imam should not be paid , this is called selling Islam for petty gains. If they need money they should earn other than just leading Prayers or Friday sermons..
That is why now a days every second mosque in world fight for Imams. because this is very lucrative offer.. See Dr Yasir Qadhi , Omer Sulaiman etc imams in West living on Imams salary with luxury ..
Again , Imam should not be so secular by getting only religious education rather they should learn skills like Prophet Daood and the great Companions (Sahabas) to earn the livings from their own hands while serving deen .