Here is how I would think about it. About how badly would you have to run where you would just get disgusted and quit. Well I admit some people never want to quit, but a rational person would say "screw it, it ain't my weekend". If that is say losing 25 units at the BJ tables and 25 units at the craps tables, there you go. Divide it by 50.
As for the worries about who plays with you, forget about it. That is just wanting to come up with an excuse for your bad luck instead of just bad luck by itself. A few days ago I was at a casino and playing a little BJ while waiting for some friends as they got ready in their hotel room. There was a guy there from Europe, not sure which country. He had a horrendous accent and worse understand of BJ! The guy kept saying "I wan't to double down". The dealer would then turn over the cards and the guy would have 20! First two times it happened I burst out laughing at the fool. Third time I was like get a clue buddy. This guy claimed he didn't understand the dealer's instructions and he did stupid things all the time. If he didn't have 3 clueless family member women betting as much as him (badly but at least understanding the basics) I might have thought maybe he was an angle shooter. One hand he put his cards under his bet (single deck game) and the dealer turns over 20. He complains she didn't offer him a chance to hit. He has a total of 9. The pit boss tells the dealer treat it as a push and then lectures the guy. Where does it all lead? Well he has a hand later where he hits and gets a 2, then stands. Dealer was showing a 10, turns over a 6, then hits and gets a 10 for a bust. Then going around to pay people off, turns over the "dummy" hand and he had an 18!!! He hit 18 and caught a deuce and when the dealer would have busted. I had 17, the other two remaining players had 18. So we all pretty much lucked out thanks to this horrendous play. It doesn't always go against you. I just got tired of the delays and how the dealer felt compelled to make him show his cards before he made a decision, so I left a few hands later, but up 5 units.