Do we need to be Lifetime PLUS members to qualify for the "bigger" prizes?
For the grand prize and some bonus prizes. yes.
It is Great Idea for Giveaways. I suggest you can only win 1 prize. Given the volume of users it would give everyone a greater chance to win. Last year I saw one person win almost every drawing. I was on during the duration of the giveaway and won nothing. Good luck to every one.
Its all random.
We can't mark people to only win 1 prize. if we had to do that, the Day of Giving would last like 2 weeks instead of 3 hours.