diamond parking is private parking company, they can't do anything if you don't pay the ticket
i got a ticket like 7 years ago, never paid, they even threat me for court action, i completely ignored, and up to now, nothing ever happened... just have to remember, if you go to safeway or staple free parking with diamond parking ltd enforced, just make sure you went there for shopping not just park and walk off, they won't be able to do anything to you. if you go to a pay parking area with diamond parking ltd enforced, buy the parking ticket and make sure the meter is right, again they can't do anything about your car.
on the contrary, if you got a ticket from city government, pay it off