Is it smart to make a similar website niche to someone else?

[AceInfinity]

Nope, you have to make it appealing and you still have to have a good advertising plan to get your viewers.

[Yellows]

As Omni says,

Though I personally see nothing wrong with doing so.

[AceInfinity]

There's nothing wrong in doing anything senseless if being senseless is the worst of the matter, there's just no reason for it. That's what I'll say.