Other explanation
Odd, I thought that the ISS was expanded to accommodate the extra crew. Maybe the issue is that Russia needs to plan on freeing up more seats for US Astronauts due to the shuttle's retirement?
Russia's space agency chief said there's no more room for space tourists in the International Space Station after this year because of plans to double the full-time crew at the orbiting outpost Roskosmos top brass Anatoly Perminov told the government newspaper Rossiiskaya Gazeta in an interview published today that the last …