Unlike giving to a charity where you know your money goes to a good cause and you get nothing in return, pastors play on your desire for more when preaching about tithing. They won't say you'll definitely have more money if you tithe but the implication is there the entire time.
First the verses of "God's promises" (These are always Christian favorites. These are the quotable verses, the ones you put on a special card or key chain. I get it. You sure don't want Deuteronomy 22:28-29 as a fridge door magnet!)
Jeremiah 29:11 - “‘For I know the plans I have for you,’ declares the Lord, ‘plans to prosper you and not to harm you, plans to give you hope and a future." Never mind that this verse was for the entire nation of Israel and not special shout out to you. Sure wouldn't want to read anything in context!
Philipians 4:19 - "And my God will meet all your needs according to the riches of his glory in Christ Jesus." First, there is nothing about tithing here. Second, Paul is speaking to a church, not YOU!
After the verses, and more promises that God will perfectly take care of you (In the old school days a singer would belt into "His eye is on the sparrow" about now.) then comes some amazing examples. The Crossing first told of a couple who tithed and God gave them a booming business (A huge storm hit Bloomington and their construction business hit the jackpot! Yeah God!). The next week was a story about a lady who prayed that if God gave her money she'd use it wisely. She then goes to her daughter's shower, gets a scratch off lottery ticket and wins $100,000. The parallels between her scratch off, and the money people put into the church in hopes God will shower them with blessings, is down right hysterical.
All this plays with people's minds. They want more money, they want nice things, they want to be out of poverty, and just like putting some money down on the blackjack table in hopes of winning, they do the same with giving to church. It's all shrouded in grace, love and generosity but it still comes down to greed. If it wasn't about the gamble of "you have to put something in to get more out" then the example stories wouldn't be needed.
They don't show the stories of the people who gave and lost their jobs, lost their homes, got sick and died. Tithing gives the illusion of security and protection. People are led to believe that if they put in 10% plus then some supernatural voodoo will happen and they won't have financial issues. This is also where shaming comes in. If someone says they are broke, they are sick or they are down and out, the first questions are: "Are you tithing?" "Do you have faith?" "Have you put Jesus first?" "Are you praying?" Blah, blah, blah... So if shit isn't working out then you'd better believe it's Your Fault!
Pastor Eric Dykstra - You are a prosperity preacher. You might not like the name but you really need to own it. You are using people for your own gain. Again. Just with the new tagline of "grace". It's wrong.