What about the people that just want to mod their cars?
If you park a car in front of LSC it should self-destruct after 2 minutes and you should have to buy it again. For the rhino all 1.5 million too.
First of all, you only buy a Tank once to pay the $1,5mil, and then pay another $1000 to call it from Pegasus.
But since you cannot actually "lock" these Tanks they are useless for this.
I have my own Tank as a Personal Vehicle to be able to lock it and stuff.
Also you just shoot the mechanic before going into passive mode and chilling on the small roof.
This way the LSC will be closed as some people with bikes manage to leap next to the Tank and inside LSC.