Answer:
Some beekeepers believe that the more stings a beekeeper receives, the less irritation each causes. They consider it important for safety of the beekeeper to be stung a few times a season. Beekeepers have high levels of antibodies (mainly IgG) reacting to the major antigen of bee venom, phospholipase A2 (PLA). Antibodies correlate with the frequency of bee stings.
Next Question: Why do farmers plough their land?
Previous Question: Why are genetically modified crops and other organisms, a danger to environment?