Change to 2.0 spawner crates.
My suggestion is that instead of only having one spawner crate u can open, on servers where there is or will be 2.0 spawners, have a second sort of crates.
I would split this up with u can buy a spawner crate that is 1-5 tier spawners, and keep that at the current crate pricing (Both on website and gems.)
Then have a crate where 6-10 tier spawners are in, make this pricing higher since its higher valued spawners.
This way people are gonna try their luck with either crates and what they get and people still feel like they get something valuable from the crate they choose to try their luck with.