So leave the current lotto system in place but add the ability to select scroll/seal/shard on the 20th/40th etc runs.
Would be really nice if you could select which set to select from ie I finish my 20th epic claw run and decide I'd like to select from a list of scrolls. Alternatively I could select from a list of seals. No choice for a list of shards as none drop from that quest.
It's so much better to KNOW that at some point your farming WILL be rewarded.