While it is true that by the time PCs have access to 7th level spells, teleportation and travel to other planes becomes possible and even common place, I am also of the opinion that the cost for those spells should be far higher than what they are currently
Imo, the teleport spell should require, at minimum, a material cost of ~2,000-4,000 gold that is consumed with each cast, and the material cost for travel to other planes should be bumped up to around 1,000 or 2,000 gold.
Do note that I got these numbers from the
Treasure By Level table from
Trials & Treasures, and am operating on the principle that the ability to effectively circumvent one of the three key pillars of gameplay should cost
at least half of a player's earned gold.
But I know all of this is personal preference, of course, and nobody is wrong for disagreeing with me here. I am also the "gritty realism" resting guy, so...