Give your freebie with good intention and give it the right attention. Not something that has tricks built into it. Sometimes the consumers know this. They buy it not because they think it is free. Or that they believe you.
Give them some credit. They aren’t so stupid all of the time.
They buy it for other reasons. It’s dangerous if you think they bought it because it is free. Because that’s how you conceived it.
Now, you don’t know the true motivation behind your consumers’ action. Beats the purpose of doing it, ain’t it?
What’s the price of your intention?