I have the same question, i have about 150m total worth. my stats are maxed melee, 95 prayer 99 mage 99 range 88 summoning. i have 284 ques points and i usually kill tds for money, but im not sure its the best boss. in my opinion it is definately better than bandos because its closer to a bank, much less competition, much higher drop rates, more killed per hour. The only thing is you cant let your guard down at all there or you WILL die. some people can tank bandos fine, but tds you just cannot.
I got a little off topic there lol! but yeah, my question is, should i sell all my gear and merchant? Im not sure if i should merchant while i work on 91 rc (76 atm) or should i monster kill (and what monster?).
I like camping abbys, and to answer someones question, i spend 40 hours there camping and i averaged 800k an hour with all of the drops divided by time spent there.