Possible that those shitty tips you've been leaving are adding up in other ways? I live in a neighborhood that borders a part of town that is accepted as a "bad" part of town and is often confused as being part of that part of town. I have only ever not had the "finding another driver" twice from my house, and originally assumed it was location location location. I had a guest stay with me last summer, and they never received that treatment which led me to believe it was an account thing. We'd test by requesting a car at the same time. Their rates were cheaper, and they never had a new driver issue.