I have read through the 7 pages, and 121 posts on this thread and found the 'lightbulb' icon appears 5 times. All by the same person. What arrogance.
I'm the only person that uses any icons in the whole thread- though a few contributors are on my ignore list so perhaps they've used them too. I use the lightbulb as 'here's an idea'. I'm not sure what you're reading into it but it makes me giggle to think that someone reads so much into the emoticon at the beginning of a post! Given that using a lightbulb appears to make some think it's arrogance, I'll endeavour to mix it up a bit more!