Why doesn't Jagex incorporate this to stop bots?

Or Jagex could just l2captcha. Effectively stops botters, unless all botters wished to use a service like decaptcha. Which would become very costly, and considering how many botters refuse to purchase membership it is likely to stop a lot of them.

 

And yes, there are easy ways to make it so that the bots couldn't easily get the correct captcha code. Hell, even i can do it in VB.NET.

 

Simple answer is, Jagex do not want rid of bots.

Yeah, this might get rid of the one or two bot here and there, but the bot companies (Which are the real problem here) wouldn't hesitate to develop or even buy readily available software which could beat captcha.

 

Captcha is not the way to go.

Especially when you can buy 2000 capatcha-solves for $2.