Tyre noise

[Vines5161]

I have been reading the thread about "What tyres to fit". When I bought my '03 Zetec Focus recently it had F1's fitted on the rear. Unforntuately they sound very noisy. They have plenty of tread and stick like you know what to a blanket. I was talking to a tyre dealer the other night on the phone about my problem. He said to me that they have got plenty or tread but sound like the wheel bearings are shot and I told him that is exactly what it sounds like. He said to run my hand around the inside edge of the tread and it will feel like a 50 cent piece. He was right. He said that they are stuffed and there is nothing I can do about it. He said it's a problem with most front wheel drive cars that have not had the tyres rotated every 5000 kms.If you rotate them every 5000 kms this will not be a problem.
Focus's and Fiesta's are particularly bad for it.
Has anyone else noticed this happening to their tyres or been told this as well??