Usually, they tell that to everyone who will listen to them, and then all those people send money to them and they become rich, and those people can't understand why they are not getting rich, when they ask questions they get told its because they aren't doing this that and the other and that they must keep giving.
Actually, we are not to even have lunch with those who are extortioners!
It is not a sin to be rich. It is a sin to be selfish.
However, 3 John 1:2 says, "2 Beloved, I pray that you may prosper in all things and be in health, just as your soul prospers." So there is precedent but you must take all scripture into account for the truth and balance.
Matthew 6:
25 “Therefore I say to you, do not worry about your life, what you will eat or what you will drink; nor about your body, what you will put on. Is not life more than food and the body more than clothing? 26 Look at the birds of the air, for they neither sow nor reap nor gather into barns; yet your heavenly Father feeds them. Are you not of more value than they? 27 Which of you by worrying can add one cubit to his stature?
28 “So why do you worry about clothing? Consider the lilies of the field, how they grow: they neither toil nor spin; 29 and yet I say to you that even Solomon in all his glory was not arrayed like one of these. 30 Now if God so clothes the grass of the field, which today is, and tomorrow is thrown into the oven,
will He not much more
clothe you, O you of little faith?
But then He goes on to say,
31 “Therefore do not worry, saying, ‘What shall we eat?’ or ‘What shall we drink?’ or ‘What shall we wear?’ 32 For after all these things the Gentiles seek. For your heavenly Father knows that you need all these things. 33 But seek first the kingdom of God and His righteousness, and all these things shall be added to you. 34 Therefore do not worry about tomorrow, for tomorrow will worry about its own things. Sufficient for the day
is its own trouble.
James 4:2b-3 "Yet you do not have because you do not ask. 3 You ask and do not receive, because you ask amiss, that you may spend
it on your pleasures."