No one was really abusing LL Bean's return policy if it stated it was a 100% lifetime satisfaction guarantee, their policy is what it is or now was. You can't really abuse something when they allow you to do it, no matter if they say people are abusing the original intent of the policy. If that's the case it's their fault for not making the original intent clearer by spelling it out better. For example if my policy is that if you give me a dollar and I will give you 2 dollars and I don't spell out it's a one per person offer I shouldn't be saying you are abusing the original intent if you do it 5 times as you never knew the original intent was for one per person. Now if their policy stated it was for the original owner and people were returning thrift store bought merchandise that would be abuse.
Now that said I can't blame them either for changing their policy I am surprised they hadn't changed it much sooner.
PS, as I type this I am wearing an LL Bean shirt