A "joint" usually refers to a bar (pub, tavern) or a nightclub - some sort of gathering spot for drinking and dancing. A "flashy" joint refers to an upscale nightclub; the decorations are expensive, the people in attendance are well-dressed and might even be celebrities, the cocktails are exotic, and the prices are high.
Kerim, the reason your question is not attracting attention might have to do with the fact that it's hidden within a thread about "Flashy joints". If you have a new question, it'd be best to start a new thread. That way people will see it more readily.
EX: Why should losing staff be such a big deal?
The subject tends to come before the verb, and if the verb is a form a BE, then the bits that come after it are called the subject complement.
EX: Losing staff should be such a big deal because ...