Money is like anything else in magick. The level of attachment directly correlates to the difficulty in manifestation. I’ve had money spells fail out the ass when Inwas dead broke and desperate. On the knee hand I’ve found doing money/prosperity spells when I’m in a safe financial situation bring far more results. I’ve manifested money with almost no effort (just spiritual bathing) once you have ways for money to manifest and have no attachment it seems to roll in quite steadily.
I’ll be building a new prosperity altar soon and will be sure to post pics and detail exactly what went into making it.