I have thought on the subject many a times. Well tracker gets installed for 25-30K with an annual cost of 15-20K ... Insurance for your car will be more then 70K for first year. Insurance is a better option of two as it also covers damage , natural disasters, theft etc . Good insurance companies install tracker themselves and it is covered in insurance fee.
Trackers are very easy to block. Devices are commercially available, just like GSM band Jammer, they block Satellite tag so tracker won't work .
For other last and very innocent query , Tracker guys don't stuff the car when it is running, they let it stop somewhere,like some signal or other place and then they shut it off..... the sensors are installed in the engine head ! ... Smart Thieves use Satellite Jammers and when they are at safe location , they remove the sensors as well ..... so buddy insurance is a viable option
On a Second thought, You should do Sadqa regularly each month for your car ... In my opinion this is the best insurance policy !.... and it repays BIGGGGGG TIME ! I just remembered a Hadees-e-Qudsi in this regard ....
"Aye ibne Adam
Ik Teri Chahat Hai Or Ik Meri Chahat Hai
Hoga To Wohi Jo Meri Chahat Hai
Haan Ager Tune Superd (hawale) Kardia Khood Ko
Uske Jo Meri Chahat hai
To Main Tujhe Woh Bhi Donga Jo Teri Chahat Hai...
Or Ager Tune Mukhalfat Ki Uski Jo Meri Chahat Hai
Tu Main Thaka Dunga Tujhe Us Main Jo Teri Chahat Hai
Phir Hoga Wohi Jo Meri Chahat Hai...."
May Allah protect us all against all evils which we know and which we don't ...
Subhan Allah !