Those off the shelf blue alps (basically a motorized RK27, which itself is a $15 part) are not adequate for very high quality preamps, though you'll often see them in units up to around $4K MSRP. As noted, there are a number of other remote control solutions that don't sacrifice sound quality.
The original Rogue Hera, which I use myself, has a motorized stepped attenuator (as did the more affordable Athena). The mechanism is by far more substantial and impressive than the cheap alps. While the action isn't the smoothest, it serves its purpose (remote control), and the sound quality is without fault. A few years ago Rogue switched to a motorized TKD pot, because lots of folks don't like steppers, but I love mine and kept it through the upgrade to Hera II status. Wouldn't part with mine. I wonder if Rogue would still build a stepper unit by request.
I think VAC's new Statement preamp uses an Alps RK50 pot -- which (unlike the RK27) IS an impressive top class volume control, and I believe they've motorized it. I mean, at the cost of this unit, it MUST be remote controlled, right?