I don't think you can honestly rationalise it like that.
You could similarly rationalise selling an iPad for $2,000 by 'We have a bajillion engineers, who all went to top schools after decades of non-stop education, who worked 80 hour weeks to refine every single component of this, who tested 100 different chamfers for this edge, who polished it, who ...'
The price of something should absolutely be dictated by how much the target market is willing to pay for it (and that includes ease of purchase etc) - otherwise people simply won't pay. For music, that is one of the reasons why you have so many people whining about how much piracy there is; their target market simply doesn't think that their music is worth the amount they want to charge it for.
The consumers may be incorrect, but it doesn't change the fact that the sales will be smaller because of this.
Music is frequently expensive to produce, but the sale price is largely independent of that. If you consider production costs alone, an orchestral recording should cost many times that of a band, due to its many times greater investment (an orchestral musician will be vastly more technically talented (after 2+ unpaid hours of practice per day for all but a few years of their life) than almost any band musician) and smaller market.
Meanwhile a live recording should cost almost nothing, as it can be produced simultaneously (and frequently is) released immediately after the gig.
The price is the same, because that's roughly what people are willing to spend on music.