yeah i definitely have a love-hate relationship with live painting - like when the painting isn't coming out right, you kinda have to suck it up and keep it going... after all, its a performance...
But on other occasions i get in the zone and i love the whole process... plus i get a painting done in 'one sitting' (standing) :)... so it has it's rewards. It also depends on the venue - how much space you get on the stage, illumination, how easy it is to bring my supplies in and out... all these things. ;P