Well, as long-time contributor Stuff said in the other forum, people do eventually just lose interest in doing covers, or simply no longer have the time. I did an Ultima Collection one myself at one point and did intend to do more, but work and life have simply got in the way, and I'd prefer to use what little free time I have to actually play the games I buy.
Also, while I don't mean to belittle RenKalan's generosity in the tremendous amount of work that he's no doubt put into these covers, they do represent a strong break from the established grey-spine style that Stuff created. There are practical problems too in that he tends to use lots of black in his covers, which tends to increase ink cartridge use massively, which is why I prefer to use more brightly coloured covers that follow Stuff's style. I suspect that this is part of the reason why RenKalan hasn't received the same kind of acknowledgement. Still, my sincere thanks to him/her for the effort they've put in, and I hope my constructive criticism here above isn't mistaken for a lack of gratitude.