Wow, you right! .3% of a multi-trillion dollar market is pathetic. If you look at the grocery bill for America last year which is $478 Billion and multiply that by your 2012 number of .3% you get a total bill of $1,434,000,000. That $434 billion does not even include fast food sales, beer sales, and other items that would be included in the food market total in America alone.
So let's throw out more tiny percentages to make it seem like online sales are miniscule at best even when those percentages are in the biggest market of America. Nice one.