faire valoir

Can this mean something like "collect interest"? That is the only thing I can infer from the sentence below.

La grande quantité d’argent comptant qu’il a augmente encore ses revenus parce qu’il le fait valoir malgré la loi qui défend aux musulmans de prêter a intérêt.

The vast amount of money he has further increases his revenues because le fait valoir despite the law forbidding muslims from lending with intest.

Thanks in advance for your help!

Hi,

faire valoir = to increase the value of, to see that a good or a capital will yield a profit. (in this old context)

So, yes, I guess he lends money and collects interest.