I use a 28" ryan lawnaire and charge an average of 400 dollars per core aeration. These are 20-25k sq ft properties and i normally dont aerate without seeding and fertilizer/insect control. So that brings my average take on a plugging around the golden coast of Connecticut to be around 750-800 dollars. Sometimes I can bang out 3 in a day but they'd be a little under average size.
As for raking up the plugs, DONT. The nutrients in the plugs are an excellent natural fertilizer and its foolish to take them out.