Proverbs 3:9 tells us to "Honor Jehovah with your valuable things, with the firstfruits of your produce." Giving Him the firstfruits was a way of saying 'thank you' to God for the harvest which he blessed.
Today we also want to give Jehovah our valuable things. This can include MONEY, for the upkeep of the building we use in our worship of him. The elders in our congregations have their own jobs, sources of income and support.
However, our valuables also include our TIME, our INTEGRITY, our DEVOTION. Some can do more and some not so much...Martha's expensive oil (Mark 14:3-9) and the widow's mite (Mark 12:42-44) We all have FREE WILL, the choices we make either to live in a manner that conforms to godly standards or not.
These are the valuable things Jehovah truly appreciates. HE does not need our money, but he appreciates the demonstration of our trust in Him. At Matthew 6:33, he states if we seek his righteousness first in our lives, he will take care of our needs, not miraculously, but he will bless our efforts. Malachi 3:10 is where he invites us to 'test him out'.
Please, don't let the selfishness of men stop you from learning about the true God, Jehovah. To learn more, go to JW.org.