I think the subframes, while a weak link, if maintained throughout its life doesn't need to be much of a concern. I run an early QPV which is still on original. Every few years needs to be surface cleaned and treated in situ and at some point will need replacing but it is now nearing 20 yrs old...
This is a fine car with a poor battery tech/range. 250mile is fairly poor to support the RRP. Last year's laptop offer if you ask me. I would consider it though if I was on the market.
It is very dependent what is your starting point and what are you after.
A late ghibli may be something relatively easy to live with and may well match your service budget. On the other end a 10-20yr old maserati with a ferrari sourced V8 ferrari will need more TLC but will also be more...