Oh noes! How else they gonna learn to give 10% to the church? Hmmm?
Or at least that's what some of the students I have interacted with over the summer would think.
The Old Testament tithe (10 percent) was for the upkeep of the temple and the government. Israel was a theocracy at the time, so that money given to the religious leadership was for the political rule as well. Essentially the tithe was income tax.
Nowhere in the NT does it say to tithe (or give any prescribed amount) to the church, only that Christians should give willingly and not grudgingly.
Usually the strongest proponents of tithing today are false teachers and televangelists who would like nothing better than to see your 10% in their own pockets.