Wait in line, pay cover walk in the door. People. Crammed full of people. Look to the front, girl singing songs. She's alright at it, nothing special. Look back, much less pretty girl staring down at everyone "dancing" in the back.
Want a drink? Good luck moving toward the bar.
Want to dance? Good luck finding enough room to move your arms.
What to flirt? Good luck getting that girl to hear you (or even finding a girl for that matter).
Free cover wouldn't be worth going to this bar. It's Vegas. You can do better people.