I have to agree with OV. Unless you're in a Dyna shell that has sponsored runs, or have a very lucrative craft, all you're going to be doing/spending time doing is nothing but that.
Also, keep in mind, almost 50% of relic weapons, never make it past the second/third stage. People normally get enough currency to make it to the second stage, and then get very frustrated, and they have a 50M+ item that is essentially useless.
While relic weapons are very nice, they're just not practical. There's many different substitutes, and while they may not be exactly like relic, they can come pretty darn close.
Sorry if that sounds discouraging, but I'd rather you hear it now, than invest in this and learn it the hard way.