I've never sued anyone, but I did threaten to sue a fella once to have my property returned that he was repairing, and giving me the run around on. The threat did get the fella to take me seriously and return my property repaired.
My former supervisor's wife is an attorney. She has said that you can sue anyone, but winning is a different matter. Collecting is a completely different matter from winning!
In July 2004, a teenager rear ended my wife's car. He dropped his cell phone, went to pick it up, and didn't see us stopped for the accident. He admitted fault. The police got his insurance information, and his dad asked me how I wanted to handle this. I said, let the insurance companies work it out, and his dad agreed. Since it was a low speed collision, the total damage was to the bumper, about $750.
Come to find out that he didn't have insurance. He had it long enough to get the insurance card, then cancel the policy. The insurance company tried to get him to pay up, but they ignored them. I found out later they had enough money to pay for a cruise, but not for the damage they caused.
The insurance adjuster told me that I could sue them, but the filing fee would be $120. He said that even if I won, I still might not see a dime of money from them. We just finally gave up.