Why should I hire an interior designer?

When someone thinks about hiring an interior designer they often want the aesthetic value of the place. But the topmost question will be,

"Why should I hire an interior designer, when everything is available online. I can choose a design by surfing on google. I can check furniture online and buy them.

they also imagine that hiring an interior designer may be a costly affair.

Believe me, it will not. Because hiring an interior designer will save your time and money. Plus you will get more than you expected.
Let me put few points out of many.