No, you're helping all the other pollinators too! Keep a corner of your garden nice and rough, with tumbled bricks or rocks, twigs, dead leaves etc to make a wee nesting spot for bumblebees.

We get free use of a spot next to an apple orchard, so I guess pollination is our "rent", plus some honey. I don't know what arrangement commercial beekeepers have - near us they move 60+ hives in when the oilseed rape (canola) is flowering, then move them again when it's finished. A guy I was talking to said they reckon they can break even with 300 hives, because one person can deal with that many. More than that they have to employ someone else, and bang go the profits. Sounds like a nightmare. I struggle to cope with 7 hives!