Definitely smartphone helps a lot,it simplify our day to day life by many ways.But at the same time it waste our very precious time.so I think the use of smartphone should be reduced.
It is a very common trend of purchasing luxury items for SHOW business, which, from my point of view, is a sign of childish work and a proof of actual immaturity.
An affordable smart phone that can perform normal functions online is enough. Very expensive smart phones are just luxurious. I think its a waste on one's finances.
It is subjective. What you perceive an expensive smartphone may not necessarily be expensive to the other... I think it is a matter of "functionalities": if it fits the purpose and I can afford it, why not?...
Think it depends on your affordability / budget & purpose of usage e.g. some people willing to pay extra for a smartphone with more functionalities or memory to double up as a notebook / computer etc.
It is relative. What I consider expensive is a peanut to Bill Gate. Quality should be preferred over cost. It is good that there are smartphones sold at different prices on the market. Going for the type beyond your means is frivolous style and not a necessity.