How to make good money in runescape as a member?

Ah geez I am the same way I get tired of stuff quickly while making money.For money making kill unicorns in level 25 wildy i think and sell their horns.Unicorn horns sell for about almost 800 gp each on a full inventory which takes like 5 mins you earn about 30k or more.Try doing like I do cut say 200 yews then go to the fishing guild and catch say 300 lobsters since it doesnt take long then a way to make money also is buy empty sacks at the farming store for 1 gp and resell them at the grand exchange for about 100 each or something they sell quick.As far as spending I made about probably 100 mill since I have played Runescape and all I have to show for it is 7 mill now with no rares no armor I just wasted it all.What I do to keep from spending is just try to occupy my time by fighting monsters then fishing or whatever so I am always busy.Also something you could do is say 1 day you make 600k spend 300k of it and try not to purchase anymore and leave the other 300k in the bank and after awhile you will get used to it and not spend it so much