A sannyasi should have an institution meant to preach Krsna consciousness; he need not accumulate money for himself. We recommend that as soon as money accumulates in our Krsna consciousness movement, fifty per cent of it should be invested in printing books, and fifty per cent for expenditures, especially in establishing centers all over the world. The managers of the Krsna consciousness movement should be extremely cautious in regard to this point. Otherwise money will be the cause of lamentation, illusion, fear, anger, material attachment, material poverty, and unnecessary hard work. When I was alone in Vrndavana, I never attempted to construct mathas or temples; rather, I was fully satisfied with the small amount of money I could gather by selling Back to Godhead, and thus I would provide for myself and also print the literature. When I went to foreign countries, I lived according to the same principle, but when Europeans and Americans began to give money profusely, I started temples and Deity worship. The same principle should still be followed. Whatever money is collected should be spent for Krsna, and not a farthing for sense gratification.

(From Srila Prabhupada's purport to SB 7.13.34)