All perfect praise be to Allaah, The Lord of the worlds. I testify that there is none worthy of worship except Allaah and that Muhammad is His slave and Messenger.
It is not permissible to buy a membership for the benefits of advertising or for high commissions and so on because this is a form of forbidden gambling as the person who buys the membership pays money hoping to gain profits; he may get the profits, and he may not gain anything and lose money, and Allaah says (what means): {O you who have believed, indeed, intoxicants, gambling, [sacrificing on] stone altars [to other than Allaah], and divining arrows are but defilement from the work of Satan, so avoid it that you may be successful.} [Quran 5:90]
Allaah knows best.