My biggest win actually came with a Welcome Bonus. I got $200, turned it into $10,000, and was confident I could clear the wagering requirements and still be up. I actually only had half of them left to clear at that point.
Imagine my delight when I made it through the wagering requirements with $6500 left. And then imagine my horror when I finally found the term that stated there was a maximum win of $500.
My money literally disappeared in the blink of an eye. I know it was technically bonus cash--nothing ventured nothing gained. But I spent three days getting excited and planning to spend money I was confident I'd win.
That's why it's important to check terms and conditions!