That's always been a cheap car second hand. 15 years ago they were around £10k. The running costs make that car worthless to people in the UK.
The bosses wife had an SL55 around 2010 and everytime it went in for a service he was getting bills for £6-8k. He was trying to give it away for £20k in 2013 before he replaced it with a 911 Turbo S.
The SL55 was quick in a straight line with the traction control on but that was about it. The 911 was faster and could handle the corners with it.
Surprisingly the SL55 still commands a £25k+ price tag. Probably worth it for that tbh.