Surprised this post hasn't stirred more opinion & discussion .
Worth noting that appears to be a US based article & it doesn't reflects the Uk stance on the cars chosen .
The E63 in any guise were a disaster out of warranty & the M version was no different , a deep wallet & blinkered vision required to own one

https://www.ebay.co.uk/itm/234652150220?hash=item36a25ba9cc:g:TWkAAOSwaaliloly&amdata=enc%3AAQAHAAAAoH%2FGmtbEj9EW%2B59DcW4%2BFene7iHs1kpVS5Dm%2FdoA9xr%2BLt753oaeG8E0RedR%2FTq8kyItJJFZv6lFIYydyYPyAwrwL7dav6ah1EizW3JmsyDocOjqBwtPA7iP5k0GuKlzsGMGNp%2BC0n6E38lB6esVzDKpehdwAZEM%2BvOa5cZS1mpysI3O6MHwn75XNulkd0FRsWFFkp3%2BDtFIil96WnFjkk4%3D%7Ctkp%3ABk9SR4i_uZPYYA
The 1M is clearly one that is held in high esteem by all , same with a CSL E46 ( or even a decent E46 M3 ) which doesn't even get a mention .
The F10 M5 is one that often gets overlooked yet not crazy money & have a great build quality which can't be said of the previous gen M5s

you would have to be a fool to buy the V10 E60/E61 over the V8 model for similar money .
The Z1

not a clue what these are valued at but gimicky car that hold zero allure for me at any pricepoint .
i8 :roll: has the looks & car park cred but same as the Z1 for me in terms of allure , i just see a Bmw white elephant when they could have created a " supercar " , i can still remember the feeling of being conned after my first drive in one , the doors & cabin were hard to not be taken by , it shifted to 50mph like nothing else id driven at the time & sounded fantastic but when i got down to the basic facts i was deflated , totally deflated

£100k for a 1499cc Mini engine ( supercharged ) with dual electric motors & the noise of a V8 piped through the speakers to flatter the owner

not for me i'm afraid .
The Z4M is hard not to like for what it offers but they are far from flawless & pricepoint you get into them is everything . The article suggests growing values but UK wise i don't see any change from the 1st , 2nd or 3rd Z4M i bought :? the point where the rising value overcomes the yearly / bi yearly overheads of ownership seems a long way off .
Also think the M2 & M4 were overlooked , irrespective of current market values in my eyes 2 of the best styled , best looking current crop of Bmw "M" coupes