I'd have to go the other way on that one. Herblore can be easily bought. Any skill that's 99% market time can't trump a skill like RC in my book. If you've got your pots ready, you can get millions of experience without even logging. With enough disposable money, I'd say Herblore is downright one of the easiest skills out there. The sheer XP/Hour is better than cooking if you have things set up correctly. And for RC, what do you mean it's all runners? The minority of people use runners. Air runners are about as good as Abyssing, the Law Company is an average of 30k-40k XP an hour, max--and Nature Runners are about 50k XP an hour. Now does having the best possible XP in the skill make it unimpressive, even if that best possible XP/hour is still 5-10k lower than most people train agility at (at equivilent levels, 91+)? I think not. My top 3 most impressive are Slayer, RC, and Mining: in that order.