Not OP, but suits can be really hot and uncomfortable so you only wear them if you must. For example, you would definitely wear one during harvest but maybe not if you are just doing a checkup. Not wearing one then obviously runs the risk of getting stung. Then there are some tasks, where you would like to wear protection but can't: for example, sometimes you need to remove the queen from a hive (for example, when she is growing too old, or because the hive is too small or too large, or you want to sell one). Doing that requires very fine motor control which is hard enough in thick gloves that many beekeepers will forgo them and take the stings instead.
Out of curiosity, how often do you get stung? I would have thought the bee suit prevented all that?