Forget about "greedy" beekeepers - neonicotiniods are indiscriminate insecticides. They'll kill any pollinator unlucky enough to be on the wrong plant. You know, pollinators that pollinate crops, maybe you heard about pollination, it's this crazy thing that makes your food exist.
This isn't just a beekeeper issue, plenty of farmers depend on bees (almond growers, blueberries, oranges, etc) to pollinate their crop. The california almond crop isn't a crop at all without migratory bees.
In other news: these pesticides are chronic toxins, they build up in bees until the whole colony keels over. There's other not-so-long-lived insecticides (i.e. organophosphate) that can be safely used even where bees are going to be, because it breaks down quickly, and unless the bees receive a lethal dose, they'll be able to pass the toxin.
Whine about beekeeper's all you want, you're still pissing in the well if you think using nonspecific pesticides are going to do anything other than breed tougher bugs. Why do we keep having to develop nastier and nastier pesticides anyways? Because pests are becoming resistant to all the old ones because of overuse.