> They don't seem to mention the most obvious reason: the same companies profit from both the primary and secondary market.

That's not true. Ticketmaster has a monopoly (or near-monopoly) on the primary market. On the secondary market they have a fraction of the market; the dominant players are StubHub, SeatGeek, and Vivid. Furthermore, most of the revenue from primary ticket sales goes to the venue and the artist/promoter, and they are usually completely disintermediated from the resale market.