I have never return to that Den since I got enough 25 tonkens for my neck. I farm only the 2nd and 3rd bosses and got about 5-6 Mao gloves in total, quite lucky I guess.
You don't need too much gear for it, with only GC wep and TT accs I can skip a lot of mechs, and I'm playing WL so other classes can do it even better.
However I still think they should add the glove to shop with price of 1 tonken. The neck you can still farm it even if it's slow, for the glove it is pure rng atm and rng is not what I want in gearing.
P/S: don't savage the gloves before the it drops the 3rd time, keep the first 2 gloves in your storage. Otherwise you'll regret it later.