Answer to Question 1:
I'm am indifferent. Sometimes I shop online for convenience.
In my experience however, getting my products and or purchases and the best price possible and at the best quality possible prevails over convenience as sometimes, people courier orders which are completely different from what was requested.
Answer to Question 2:
Of course, I could purchase books, data, and other products whose quality and quantity cannot be manipulated in anyway.
Answer to Question 3 & 4:
I would never purchase cooked food online.
I once purchased grilled fish online only to discover that it was not properly cooked on the inside. The interior of the fish was raw with blood in it. It was disgusting.
Cheers!