Money that can help in spreading the Krishna consciousness movement is not a part of the material world, and we should not give it up, thinking that it is material. Srila Rupa Goswami advises:
anāsaktasya viṣayān yathārham upayuñjataḥ
nirbandhaḥ kṛṣṇa-sambandhe yuktaṁ vairāgyam ucyate
“When one is not attached to anything, but at the same time accepts everything in relation to Krishna, one is rightly situated above possessiveness.” (Bhakti-rasāmṛta-sindhu 1.2.255) Money is undoubtedly coming in great quantities, but we should not be attached to this money for sense gratification; every cent should be spent for spreading
the Krishna consciousness movement, not for sense gratification. There is danger for a preacher when he receives great quantities of money, for as soon as he spends even a single cent of the collection for his personal sense gratification, he becomes a fallen victim. The preachers of the Krishna consciousness movement should be extremely careful not to misuse the immense quantities of money needed to spread this movement. Let us not make this money
the cause of our distress; it should be used for Krishna, and that will cause our eternal happiness.
Money is Lakshmi, or the goddess of fortune, the companion of Narayan. Lakshmiji must always
remain with Narayan, and then there need be no fear of degradation.·
— From the purport to — Bhag. 7.13.32
– An expert from Sri Krishna-kathamrta Bindu, a free bi-monthly magazine service provided by Gopal Jiu Publications.