If you're a home-owner you can rotate a couple of batteries and likely only use the ones included with the equipment bundle(s). But commercial users don't have that luxury, they're definitely buying additional batteries. Manufacturers commonly charge an excessive premium for add-on batteries.
Example:
- Toro Brushless Leaf Blower (51820) + 2.5 Ah battery (88625) & charger (88602): $199
- Toro 2.5 Ah battery (88625): $165
So the battery add-on costs 82%~ of the tools total cost alone. As a homeowner after n years you'll likely respond by just outright replacing the tool for a new bundle, but in a commercial context this just kills the whole idea. According to the manufacturer at the lowest speed setting each battery lasts 90 minutes, and nobody is using this at the lowest setting.