Mine's up at 83k miles now (04 4200CC). Fuel is a nightmare (mainly motorway so long term average is at 18mpg), 12k service comes around every 8-9 months, rear tyres needed replacing after 13k miles. But, I love being in it and yes it turns heads (and ears lol).
When I've bought cars in the past, high milers with big engines didn't faze me at all, so I would happily buy a 3 litre plus car with 80-90k miles on the clock as long it had good history and looked like it had been looked after. Not sure why we get so up tight with high mileage sports cars like ours (including Ferrari, Aston etc.). My first 4200 only had 22k miles on it, whereas this one I got with 69k, but it feels as tight and sorted as the low miler I had.
I am quietly confident that she'll go on well in to 6 figure mileage with out significant signs of wear and tear (oh dear, I hope I am not tempting fate by saying this!).