Technically, all FFB wheels use servo motors. Any motor connected to a controller that dictates rotation parameters is a servo. Direct-drive is devoid of gear and/or pulley systems. None the less, quality motors suited to serve as direct-drive motors are expensive. I don't imagine that a small volume of FFB-Sim-racing purposed motors will cause a significant drop in market prices, certainly not like that which commonly occurs in electronics. A better comparison would be to a specialty market such as Large Format printers where a basic replacement motherboard can cost over $4000.
Unless one has the knowledge and skills to DIY, a Direct-drive wheel for under a $1000 or so seems to be a complete fantasy. Even the CSWv2 with a nice rim is going to be in that ballpark. Once we have some more reviews with real-world experience (not just technical data), that can explain why DD is better - then we'll have something to judge by. The only user review I've read about using the AccuForce (ISR video aside) is that it's the closest thing to a real car they ever tried.
Of course, we can draw some general reference from the Bodnar wheel too but, price is then even more of a factor. Bringing a more-affordable DD wheel to the Sim-Racing market is a huge undertaking at significant risk. If it was easy, there would already be more options for users. The most interesting comparisons (IMO) will be between the CSWv2 vs AccuForce vs Bodnar but, only the first two are really significant in my case.