You can export to web[0], which creates a zoomable raster copy of the drawing, but this is obviously limited to getting an editable vector copy.
[0] For example: http://www.sketchologyapp.com/u/sketchology/18
Luckily I a) can't draw and b) don't have an iPad so I'm not a lost customer.
Lack of SVG export isn't due to wanting lock in, or even a question of priorities. I spent considerable time working with all the leading vector drawing programs and investigating their performance. The simple fact was that it couldn't work well. Even trivial drawings (20 lines) done with the pencil tool in Sketchology would cause Illustrator to lock up for hours and consume all available memory. Larger drawings would fail to open altogether.
Ultimately I think offering the feature would have been extremely misleading and frustrating for people. I'd rather cut a feature than ship a bad experience.
Often these have been generated by another SVG tool, support another tools idiocy for whatever marginal gain he might make is maybe why he doesn't want to do it.