Man, this sucks. To be really honest, Jump was extremely patient with David-kun so nobody can really complain. Plus, David-kun up to now was selling that bad (like 3k only in Volume 3) that it would have been a massive feat to make the sales even passable, so meh.
RxL suffered from poor reception later on, which also sucks. I still remember the moment it actually managed to pull of a #1 rank in the magazine at one point, and the subsequent 2nd cover LCP it recieved. Ugh. If anything, it still went on 1+ year, with OK sales to boot, which is still more than majority of WSJ newbies will ever see. It absolutely wasn't an embarassment like Hungry Marie, Bokke-san/Hachi (and likely Kamio Yui) were.