Hello everyone!
If I play through Tier 1 of a particular gate, there will be no cost to start at Tier 2 the next times. I have to do this for every gate. After some time the gate will fade out and new ones will open. So if I don't plan to play this gate several times in the next days, is it sensible to unlock it at all? How long will it take until it returns (gates names are combined, right?). Will it return? Will it stay unlocked, if so?
Once a gate cycles out it is gone for good. Even if another gate cycles in with the same name, it won't be the same gate because its levels will be different. It's generally not worth the time or the energy to bother with running lower tiers for the sole reason of removing the tiny cost to warp straight to the tier you want- consider it instead to be a nice bonus for those times when you do find yourself needing to run through a lower tier.