1. Why you can't understand that in long run you will pay more money than for a standard IM weapon?
2. They can put for sale 2 different weapons. One like we know with very good stats and expensive and another one with lower stats and cheaper for those who, like you say can't afford an expensive one.
I doubt that a char + weapon will be 6000 RPs, when only a high lvl char is more than 6000 RPs.
You have a higher experience than me, you have 2895 posts so who knows ))