Making Ulu-Duku and Skell a lvl 30+ map to avoid hackers

If it's less than 8k nx hackers can just hack a character and vote once it hits 15.

I also mentioned previously in another comment about the difference in exp, and why it should be 70 at a minimum, 80 might be over kill but that's up to debate.

Since I assume you want an HB mule for SELLING leech, I'd assume you have an HS mule over level 80 for max HS, yes?
meaning all the "necessary" requirements to sell leech are already there, HB is a luxury, if NLC potions are rebalanced, HB might not even be needed.

Since you're selling leech I also assume you should be able to put in 3~4 hours ish of selling leech in order to fund leeching your HB to 70 ONCE, since if you sell 1 hr of leech you get 80m, you then buy 2 hrs of leech with that for 40m/h.

It's even easier for higher level sellers (1hr of petri leech at 120m [which is low] will buy you 3 hrs of leech up to lvl 105).

Just as you put a certain amount of hours once into investing for better gear, consider an HB mule part of your "gear" and you need to invest a few hours to get him to lvl 70 once, hell make him 90 and use him for CWK in the future.