Let’s get straight to the point here.
You buy advertising to push traffic to your site.
You get all excited, but in that excitement, you forget the one fundamental thing, testing that your link actually works.
All it takes is for that little semi-colon or a slight misspelling of the link to your site to render your ad completely useless.
You’d might as well pour your money down the drain.
So when creating your ad, check the link at least twice, or even better get another pair of eyes to check your link.
All the best