Probably the best thing ever happening to me was...
well, I have printed the German version of my webmanga Remember, and I was sitting at one of my first conventions and suddenly a girl comes by, sees my stuff and claims: "Oh! I know you from animexx! I've followed your manga for so long!"
See, the website where I was active since 2001 is slowly dying and I actually didn't think that anyone there was still active or at least remembered me, so... I was super happy at that moment!
This encouraged me to go on more conventions, where last year, out of the blue, two girls stop in front of me and after a little small talk, I can see that one of her is thinking really hard - and then suddenly calls me by my very first online nickname ever.
Turned out she was a close online friend from around 2000 to which I unfortunately lost contact years ago! And she even lives 15 minutes away from me by car now! 
The best thing my webmanga has achieved for me so far: It has connected with new and even reunited me with dear old friends. There have been some hard times, too, but I would not trade each and every one away, because Remember has mainly brought me only good things! =)