Roscosmos was not shy about the motivation to take these tourists. He noted that these travelers were contributing to the funding of the Russian space flight industry, including future Soyuz vehicles. Advertising is almost secondary – it's as much about supporting future missions as it is about something else.
The launch in 2021 will take place under different circumstances. Space tourism will therefore not be as innovative as today, companies like Virgin Galactic seeking above all to bring non-astronauts into space. This could easily be a steal among many, rather than a novelty.