The Arrangement

I think the opening lines of this heavily relate to flash-in-the-pan bands, be they indie or mainstream. Tons of bands come out, everyone raves about them, and two years later they're nowhere to be found. So it's really not worth taking the time noticing who today's big thing is, because tomorrow they won't be remembered by their fickle listener-base.

The singer then wonders if he's guilty of trying to cash in in a similar way. Concrete skin I think is a way of depicting stubbornness, not changing his position in spite of his conscience.

The chorus of "one for all/all for us" is simple enough. When promoting a band, especially larger acts (think American Idol), they're virtually marketed on their agreeability, to appeal to the broadest audience they can, and all that effort and promotion is really only for the benefit of a handful of people.

The verses then return to the critical spectator who stated the opening lines, with the singer conveying his agreement towards the critic. It's likely that this person he's singing to is someone he's involved with.

I used to think this was a love song solely due to the last couple lines here, "angels arranged us...to make up for some old sin". That is still possible, but keeping to the theme, this could be in reference to the way entertainers and public figures often hold god or godly forces accountable for their success. You hear it at the end of every sports game, you hear it every other time someone wins a Grammy, Academy Award or almost any other sort of award.