With how intensely I've been playing for the past few months, I've been purchasing VIP time throughout most of that and actually reached max VIP rank at long last. This week I let it run out though, as I've been taking a bit of a break until the release of the next module and didn't want to feel like I had to log in every day to claim my free keys during that time.
On the occasions I do log in, I've been missing the perks like mad though! Mostly I keep trying to invoke in places where I can't, and I've previously written a post about what makes the travel signpost so attractive. Now I also miss the ability to summon a mailbox or banking portal at will.