Too bad OP's images are gone. Now I'm really curious.
As for the tangential topic, Over-rendered concept art can actually be.... harmful in some cases, I think. First, it can be an attempt to hide the poor underlying concept (and like Brashen suggested, superficially polished images get a lot more attention, even here). Second, time spent rendering takes away from time spent exploring the idea / other ideas. I bet this stuff has already been mentioned though.
On the other hand, sometimes you do need to reach that refined stage to spot certain problems. Sometimes being rough is... indicative of an unwillingness to confront the real problem layer of the design.
That's the experience that I've got from my personal development anyways.
Jamen jag tror att han skäms, och har gömt sig. Vårt universum det är en av dom otaliga spermasatser som Herren i sin självhärliga ensamhet har runkat fram för å besudla intet.