1: If you compared and electric car next to its gasoline twin in looks, performance, and features you would see that they cost at least 3 X more. In other words you would still be paying at least 50% more for the vehicle.
2: Though both gasoline and electric batteries put out explosive vapors (this is why they tell you to make the last connection to the frame when jump starting) gasoline would not pour in a roll over because it is normally stored under the trunk where the batteries (from the designs I have seen) are stored under the passenger compartment and would be above you in a roll over. Though the added weight might turn you right side up, if you were upside down in a ditch it wouldn't. How would you like to be in upside down in a car and the only way out is through a curtain of acid? Furthermore, if the batteries did rupture in an accident, how bad would that be for the environment and how long would they close the road down to clean it up?
3: Recharging can be a problem in itself. If you forget to get gas after work, you can just leave a bit earlier to resolve this. If you forget to plug the electric car in then that will take a whole lot longer to resolve. The shear lack of recharging stations would also be a deterrent. The closest place that sells an electric car might be out of range to get that car home.
I am sure there are other reasons so if I forgot your favorite, sorry.
Funny how you say you can get the car conversion kit for $8,000 when just the Li-ion batteries alone cost $10,000 I guess we could assume that the kit does not include the Li-ion batteries.
The batteries (the fuel source of the car) have to be replaced every 100K miles or 5 yrs, that would mean that every year you cars value would plumit an additional $2,000 on average, every year or 20K miles. Where a less full gas tank has little effect on car value. Let's see, if you had a small car valued at around $18K , Spent $8K on the kit, $10K on the batterie, found a shop to install if for $3,600 (a friend gave an estimate for his shop) that means you just spent $21,600 (not including home charger and its instullation) on a car that was worth $18,000, and I highly doubt the car you created is worth $39,600.
Funny how you say they don't explode. I have read storys of Li-ion batteries overheating and exploding in laptops