I'm a bit obvious I guess. I am still learning Tarot, but even after saying this I wonder if this experience will ever stop. I somewhat doubt it. When I look at the professions I'm more skilled in then in the eyes of others I'm a "pro". How nice. But to me I feel that I am still learning, but that much and when looking at a timescale of, say, a month then the learning curve is slowly becoming shallow but I am still learning new things every now and then.
As for the rest.. Sharing experiences with others and, here we go again, learning from other experiences. Most of all I guess that its a very good place to dump my experiences, feelings and impressions while knowing that a majority will pick them up in the way they were meant. Most others who aren't really interested are likely to have enough decency to kindly ignore the posting as a whole.
Last, but not least, I find fun and amusement in writing up my own experiences and it really stimulates me when hearing from others who sometimes tell me that reading my ideas and thoughts actually helped them to form their own. Which is, IMO, in the end the sole reason. Helping each other and sharing the fun.