1 - Based on what was said, multiple entries are allowed. 2 - They didn't remove ALL entry slips, left several
These contests are all about having people come back and apply gain, and again, and again.
How many little things the the parents pickup at KMart simply because they were there and it was convenient? Probably a fair bit.
Also, use of physical violence isn't explicitly banned by the rules of tic-tac-toe. I think I've just found a new winning strategy that "isn't cheating" :D
If a contest doesn't limit the number of entries, you're allowed to enter as many times as you'd like. "Cheating" has a specific definition and the definition doesn't apply here.
The "spirit" of the contest is subjective. Perhaps the spirit of an easily gamed contest for me is to teach my children a lesson about math and strategy. Maybe it's to teach my kids strange ethical lessons.
No one would be down voting or calling it unethical if the state lottery allowed you to enter as many times as you wanted for free and you kept entering.