I don't see how they could make them much more expensive to run as the fuel is electricity.

Most batteries are the same, quick to charge the first 80% - which is what most will take advantage of.

Electric motor technology is advancing rapidly, as are batteries - 10 years ago EVs had an average range of less than 100 miles.  Who's to say what it will be in 10 years time.  The demand for EVs will certainly drive improvements in both vehicles and infrastructure. 

Of course you would have to wait for a charging point to be free in the same way as you do for a petrol pump but charging points are far cheaper to install than pumps and large storage tanks.  A lot of the base infrastructure is already there with electricity supply cables going to millions of lamp posts.  There simply won't be the need for refuelling stations as there is for petrol and diesel vehicles.