if you are talking a out servo motors, depends in brand...and etc...AKM Kollmorgen if i remember right start at around $550, and even if you go DIY kit with cheaper servos, u are surely looking at $1000 USD approx.
so if TM is entering the DD market, they will want to be competitive, $800-$1200 is my guess. but first thing I would do is check what DD motor is in there. and of course, also in some extend, has to do with the looks of "end user" / "consumer" product, which imho most DD wheel do not look like consumer products, so might be TM who got it right for the mass market.
...shall see what happens.