Of course. And when the time comes, I will quit forever. Right now, I guess my life has nothing interesting to offer me to do instead, but that will change. I'm guessing I have one or two years on Rs, then it's the end.
With supercompost, and magic secateurs, duh. And I also have access to the trolleim patch, no point in mentioning it though, no difference except it has no disease.
I would say yes if the person varies what combat stats they use. Such as said: 98 magic 98 ranged 98 att 98 str 98 def. Also yes if the person from level 3 trains their combat by only using slayer. There u go.
At the duel arena, where u stand to look at the fights, I heard that you don't get any randoms, I haven't tried myself, but a lot of people alch there in world 22, and for the time I was there, watching, no one had a random, so I'm assuming it's true.
You seem worried about the price. I say, get a rune defender in the warriors guild, it's free. All you need is any set of armour, and depending on your level, a couple of hours.