The Mojo had sold close to 50,000 units, the last time John Franks mentioned a figure (the current serial numbers also seem to start 5xxxx, which supports what JF quoted), so any dealer knows that if he stocks the Mojo, he has a good chance of selling them quickly.
The more expensive Chord products, like DAVE and Blu2 are built to order - this does reduce the business risk for Chord, of having unsold equipment in stock. There do seem to be quite a lot of posters on Head-Fi, mentioning that they have recently bought a DAVE, so my instinct is that sales of DAVE are still healthy, and I believe that any dealer who ordered a DAVE would sell it reasonably quickly.
In the early days of the Mojo, there were plenty of posts, from owners who said that they went to their dealers intending to buy a much cheaper DAC, but as soon as they heard the Mojo they got their credit card out straight away. Quite a few of the DAVE posts, currently give me the same impression - people have heard the DAVE at a show, and instantly ordered one on the spot (and sometimes a Blu2 to partner with it), because the DAVE made such an impression on them.
Ultimately it is a chicken and egg situation - I think dealers would easily sell any DAVES in stock, as soon as they were demoed, but the dealers will not get a DAVE in stock in case it is not ordered.