The R/C industry is VERY fickle and very Flavor of the monthish, If a company does not have a Totally new vehicle every year they will warm over the one that they have that sells the Best, Most companies are on their 2nd or 3rd and sometimes 4th generation of Short Course truck.
Most of the shops by me have a ready supply of Duratrax stuff you just have to ask for it or know where to look. When I asked one shop owner about them, he said "oh, we nomally stock up with those around Christmas" Why? they can sell Losi's and Traxxas all year long, but @ Christmas they don't have time to do "the sell" and they need to hit a price point. Duratrax allows them to do that with a proven reliable product.
Problem with having a good entry level brand is, It's considered an entry level brand, so if people get serious they will move up to one of the big boys and also the aftermarket manufacturers are not as likely to invest allot of effort into parts for'em and aftermarket hop'ups are a big selling point.
The Bottom line is that the parent of Duratrax can continue to milk somewhat older designs for many years to come with little to no Capital expendature, where-as to take Duratrax to the level that they could stand with Losi, Traxxas or Associated would require a major injection of $$$'s ADn they might be taking sales away for one of their other lines.
The way I look at Duratrax and especially the Evader series is they are kind of sleepers; yeah, they may sell a ton of them @ Christmas, but people who REALLY know their R/C's know how good they are and it's kind of an inside secret.
SHHHH! Don't tell!!!!
Dingo, TF2, Scratch built Jeep, Scratch built Scrambler, Hi-lux mongrel, Associated SC-10, Slash 4X4, DTX Baja Bug, CC-01 CJ, RC-10 and quite a few more too numerous to mention.