No a "pirated" wii is not as durable as a "real" wii. The reason is because a "pirated" wii can get "bricked" or it can stop working all together. If your looking for a hacked wii I would not suggest...
Yes, the sensor bar comes with the Wii. If you lose it or it gets damaged, you can buy a wireless one in stores, but it is recommended to be a wired one, they work better, because the wireless ones...