This is why dinner with Jay Z is stupid is because:
You're assuming he's a great business master mind first and foremost in general:
This sounds dumb at first, but let's be real. Jay Z made his first million drug dealing, then became a rapper, and has a clothing line that he developed with the help of others. Like many who have struck gold, it's hard to translate their experiences into tangible advice since it's so based on circumstance. If you wanted Jay Z to give you useful advice, he'd have to tell you his whole life story. Even if Jay Z tried to help you, it'd be long before you got results if at all, because what worked for him would be completely different for someone else with a different background or who has different types of friends.
2) everybody knows Jay Z is a bytch/a$$hole. He might treat you condescendingly, maybe he might probably tell you nothing of value.
3) Jay Z meets plenty of people every day. You'd need to actually have something that's viable and tangible for him to take seriously. "Ideas" isn't enough. You must be business savvy and show it. You must show you actually have potential. (Etc. You have multiple EPs or you already started you business or the only thing left you need is funding).
4) 50k can help you start a business or pay off crippling debt immediately. The results of having dinner Jay Z may not be apparent for a while. Hell, 50k can easily turn to 75k by just buying promising stock.
I ain't some pessimist. You just gotta know for sure that you got that it factor.