From CIC FAQ:
The 5,000 cap is not the first 5,000 applications received, but the first 5,000 complete applications received, as per the document checklist; including any new forms and requirements. Incomplete applications will be returned to the applicant and will not be counted as part of the cap.
Those who submitted complete but disqualified applications (eg: does not meet income criteria) will waste valuable quota, since CIC will simply shutdown receiving new application and stop process application in the waiting list.What is a complete application package?
Your application package is complete when you have:
answered all of the questions on the application form, and
submitted all the necessary documents along with your application.