Definitely understand the feeling, but I would argue that the rare egg machine is probably not even the best way to get a Succubus. If you consider the sheer number of monsters that are in the machine, the odds of pulling out a specific one that you want are astronomically low.
Drop rates definitely suck, but one thing interesting about this game is that there's enough diversity in monsters that you can almost always find a substitute that will suffice. It may not be optimal, but it should usually work. And with the ability to use friends as Helpers, your friends can often fill in whatever gaps you have.
So, with that out of the way, there are a couple of other ways to get Succubus. Notably, the Pal machine (although I agree the odds here are definitely not in your favor), but even more importantly the dark mech dragon dungeon (which should come around in a week or so). The Dark Mech dragon dungeon is almost hands down going to be the best chance for you to acquire a Succubus, because a) the base chance is already pretty reasonable (maybe 8-10% on Expert in my estimate), and also it can go on 2x drop rate.
Of course statistics by their very nature don't guarantee you anything no matter how many times you try something, but if you do really want a Succubus, I would try to hold out until Dark Mechdragon comes around, and try to hit it full force in hopes of a drop.