Hey Strike, Here is how I view the subject. It really doesn't matter whether you read to rules (by clicking their checkmark box) or not. When it matters is when you win and there is a Affy. That is when the rules really come into play. Mainly that check box is for eligibility. However it can also indicate permission to sign you up for a newsletter lets say.
So my thinking is win it first then find out. If you receive a snail mail or a newsletter email, you can opt-out of this later on. The snail mail can be thrown into the trash can.
If you win, ask for or look up to see if copy of the rules is available.
Thanks for the question,
Mr. Sweepy
As President of Sweepstakes Today, one of my biggest rewards is reading about your wins and the positive impact it can have on the members.