maybe because the guy behind it is one of the founders of Lomograhy?
below taken from the BJP article, link i pasted above
"Florian Kaps helped launch the Lomographic Society, he was behind the largest online collection of Polaroid images. Now he is leading a group of investors and Polaroid veterans in a bid to relaunch instant film, a year after Polaroid pulled the plug on its legendary films. Olivier Laurent talks to Kaps about his plans."
Probably the sx 70 wold be commercially more succesful for them if they intend to use a similar approach as lomography (retro, hip, funk, cool, garish etc... dunno) ... just my 2p