A: There is no doubt that the focus on recording useful articles, sermons, and beneficial discussions is helpful to the Ummah (Islamic community); thus, whoever is involved in this work to benefit the Ummah will be rewarded.
Moreover, there is no harm in selling such tapes for nominal prices to avoid burdening people, and to be able to use the money earned in accomplishing their mission as well as helping people in acquiring Islamic knowledge and spreading it.
So, a knowledge seeker should choose the tapes of scholars who are recognized for their knowledge and scrutinize them to insure they are beneficial, then he/she should circulate these tapes to their family, fellow Muslim, and colleagues to hear.