Just an observation. It does look like with the "expression of interest" it is a very simple process. So people just sign up without even knowing if they qualify to sponsor their parents.
So with CIC choosing 10,000 from the lottery, there might be a more sizable number that DO NOT meet the requirements. In previous years you sent in an actual application.
Right now quite a few who have been invited to apply are asking questions whether they can or cannot sponsor their parents.
This is probably CIC's mistake in assuming that an expression of interest to apply means that all are eligible to apply. Will CIC conduct a supplementary draw if they find that they do not get 10,000 valid eligible applications?
Or will the number increase for the following year?