But FHBH12,
The are no immigration stamp fees between singapore and malaysia.
The opening of the HSR has been announced by the Najib and LSL by 2020 (I agreed it can be delayed)
Kindly note that the station will not be in JB, but nusajaya.
Please refer to the below hyperlink for park n ride facilities in KL.(1.5 SGD/month, promotional)
http://www.nst.com.my/nation/general/rm4-to-park-at-gombak-lrt-station-for-march-1.227038
I am not trying to say that 1.5 SGD/ month is a sustainable rate, but if you read the article you will notice that this aconcept is being implemented in KL, and the authorities will make sure is kept very affordable.
You raised the question of the car, but, ei... It's unfair to allocate the cost of a a malaysian car just for this. A car is a basic necessity in many parts of the world, save for singapore where is a luxury item.
You should look at the positive side of our discussion, by living in nusajaya you will be able to,buy a car 3 times cheaper than singapore. So, a the end, you are saving even more.