They make money on blade replacement cartridges. If the base unit lasts longer they still make more money in the long run from consumables. A lot like electric toothbrushes.
Source: I have this shaver and buy replacement blades a few times a year.
Yep they basically give the handle away for free anyway just to get you on the blades. Giving away accessories at no-cost-to-them is totally on brand. I doubt many other companies will do it, as accessories are usually moneymakers.