In order to get to the temple, we need to be paying our tithing. It is part of our baptismal covenant and many, many people will openly attest to the miraculous way the Lord has blessed them when they have faithfully paid their tithes and offerings.
But it is odd how when it comes to not limiting our children how little faith we seem to have. Far too many of us say we "can't afford" more children.
Paying tithing is part of our baptismal covenant. Not limiting our children is part of our sealing covenant. Our sealing covenant is a higher covenant with a higher blessing.
So why do we think God won't be more generous in his tender care for us when keeping our higher covenant than we do for keeping our lower covenant?
We should know and trust our God better than that. We should believe Nephi who said "I know that the Lord giveth no commandments unto the children of men, save he shall prepare a way for them that they may accomplish the thing which he commandeth them."
Surely, he will provide tender and watchful care for those who are keeping their temple covenants. It will be as we keep the commandments that we prosper in the land. Putting the commandments behind seeking our own prosperity will only backfire. Even if the Lord allows some to gain wealth by it, they sadly do so at the cost of eternal rewards.