1 – The stake makes no difference to the RTP of the slot. Ive seen. And ive checked.
2 – The reason you see less huge wins at £4+ stakes…. less people play them. I looked at a casino database the other day of 19,000 players, the average slot stake? $0.49.
3 – It works on the system of a roulette wheel. Imagine a wheel with 8 billion rungs, each of them pays a different amount of “x”. Whichever the RNG lands on, it spins in a visual version of that. There are usually 40billion or so to choose from. Thats why sometimes you think “ive seen this window before”.