I hesitate to say they are good at marketing... the way they release things with video touting it and these preview periods where they tell you what is coming and give you 24 hours to think it over before they open up sales is a good strategy. The issue I have with them is how I feel they take advantage of people by saying "best lot yet!" and "last chance ever" every time they get something, there is good marketing and then there is that kind of used car salesman BS. That said while everyone falls for hype and makes a bad buy at some point, when they tell you about this stuff a day in advance and for the price they ask there is really no excuse for people to not educate themselves better on what they are buying, so if buyers would stop falling for this Classic would stop doing it. Those humped Mausers are a prime example of this, look at how fast that overpriced junk sold.
I've never ordered from them so I can't say, but what would hold me up from ordering a gun I wanted them at a reasonable price is how many people seem to take issue with difference between what Classic advertises and what they got. I do know someone who got two K31s from them a couple years ago and both were nice and as advertised so there is that.
I'll be real curious to see if they have any K31s in the near future and how they are described given Century just had a handful for sale that appear to have been pieced together from spares; none that were listed had mags, some had cracked stocks, missing parts, etc, and if they do I'll bet they describe it as being a lot better than what showed up at my doorstep today (FWIW it was about the condition I expected aside from probably needing a new crown).