Tithing is often misunderstood and mis-taught, a few points:
1. Even though the Temple tax was required to be paid with money, it was forbidden to pay the tithe with money.
The tithe was 10% of the amount of livestock and produce stores calculated periodically - not 10% of every seed, but 10% of the increase in amount of seed you had 3 years ago.
The tithe only applied to farmers in the Promised Land
The tithe was not given to the Temple, the priests cooked it, kept a portion of the tithe and returned the rest to the tither who fed it to his family and strangers - essentially an early welfare program.