I also have a high idle problem.
I noticed that my idle would every now and then go up to around 2K. Later on i figured out it has something to do with my heater. The idle will be around 2K only when my heater is on. So when i was sitting at a light i turned off the heat and my idle dropped down below 1K and was completely normal. I turned the heater back on, and idle went back up.
So yeah, it hasnt caused any problems with the car at all and has never ever done it when the heater is off. I dunno if your high idle works the same way as mine, but just letting you know you arent the only one out there. Do you guys think i should get mine fixed right now? Will it even cause trouble in the future? Or is it alright to not fix it this second?