God, yes, this, a million times this.
ESPECIALLY with how easy it is to get XP now, which I love, but - I'd much rather do the Thousand Maws with a party at level 25, or at least have the option to, without stalling my PGL out or something like that.
Not a necessary feature right away, I don't think, but it's definitely something that they should look at as an optional "do this and you get better loot". It wouldn't be too hard to slap a multiplier on the number of seals received, either.