Check out my question
The summary for this is as @FEichinger said:
Stop caring about accepted answers! A wrong but accepted answer does more harm than no accepted answer at all.
In my opinion, don't care about anything that is not in your control, and the OP accepting your answers is one of them.
The best thing you can do, is write good answers, which will inturn get you upvotes! And yes, this matters- to you and to the site, as well since upvotes not only means the problem can be resolved but also, in most cases, that the answer is good- the method used to solve the problem is appreciable.