1) You can hear a conversation in a dive bar
Once the smelly guy in the ratty t-shirt runs out of quarters to play Velvet Revolver songs on the jukebox; the building will be at a sound level capable of exchanging words. This is called having a conversation, something that makes being around other people more worth it, dependent on your company. At clubs it is impossible to have a conversation beyond yelling, "I can't hear you!"
2) Only if the cover band playing is really popular will there be a cover charge at a dive bar
Who wants to pay money to go somewhere? The whole reason people leave the house is to avoid raising their electric bill. Dive bars will rarely charge a cover charge because who would realistically pay to enter a building with asbestos in the chairs and food? Clubs, on the other hand, charge money to enter because they know how powerful the hormones of a desperate male can be that they would hand over cash in an attempt to supplement it.
3) The quality of people in a dive bar is better
The types of people you will find in a dive bar are far greater than you will find in a club. That is not to say everyone in a club is high on ecstasy and shallow; odds say at least one is not. Dive bars are more diverse. You can find everything from a tired tow-truck driver to the pretty girl that works at the local dentist office. In fact they may even leave together. Dive bars are magical like that. Inhibitions are lower and your status does not matter, unlike at a club where it's all about who you are in society and how many friends you have to hold back your hair when you throw up.
4) Honesty is the dive bar's policyA dive bar makes no secret about what it is. If there's a blood stain on the floor, the bartender will probably not come up with some clever trickery to make the bar sound more appealing. Dive bars have no secrets to hide. They make no promises of providing fun and happiness like a night out at the club would. Bars are a place to go and whatever happens, happens.