After reading an article on photography, I realized that mega pixels of camera is not the deciding factor in opting for one of them. The resolution of the camera is only a factor that we all account for, but it has certain limitations of its own. That means that for us to view any photo on our computer screen or print it from a printer all depends on more factors like sensor, focus, steadiness of hand, stability of photo, ISO, its modes(feature available in cameras). The resolution in capturing image is important factor as it to be presented, for instant if any particular image is absorbed by the camera is of good resolution the output we see should also match for the same, what is the point in absorbing any image more than what it could be presented.
So, 5 megapixels are enough for usage. It does not mean that more than it is unaccountable but optimization of it is not possible. High megapixel mean as the systems will also take much of time to process or otherwise we need heavy ram to realize it which apparently increase the cost.
Therefore getting good specification is not considered to be wise unless otherwise utilized.