Every answer here is guarded by an automatic test, not by a promise.
Can a level be bought?
No. No paid item touches EXP rates or payouts — pinned by a test, not a policy.
Does wealth earn EXP?
No. No granting formula accepts a gold amount; the loop gold → EXP → gold is inexpressible in the code.
What about alts?
Acts without a real counterparty do not count, and clusters of linked accounts are visible to the integrity detector.
Will progress burn?
Levels do not fall, expire or reset — through seasons and through any curve retune alike.
A long shift, same EXP?
EXP is per act; gold is per time. The longer shift pays more gold, not more EXP.