Its always good to know rules to the "T", its valid for any casino, not only rogue ones and not only RTG
. Also if you read rules thoroughly you form oppinion about that particular casino based on the rules, i always invest 1 or 2 hours to read the rules (yes its boring like hell but pays off most of the time). Too many casinos tend to hide some crucial rules in some sections where you normally wouldnt look for them, and if you miss it they will surely not miss a chance to not pay you, so its advisable to read complete sections of T&C, withdrawal, banking, mostly everything.
Simple logic leads me to believe that all those "rogue" casinos were surely paying to someone or they would cease to operate long ago, i doubt anyone would continue to deposit where he is not payed. And knowing T&C always give you an edge on live support if they refuse your withdrawal.
Also i find it very hard to speculate if some slots are tight or not, my luck has changed too much in the past on a same slot, in addition if i would believed that slots are rigged on any descent licenced casino i would stop playing completely