Well... quite honestly, I think it might be a bit confusing if you DID play on the official server. Players would constantly be wondering... is that the REAL Jason or just the fake Headcrumbs version?
It fooled me the first time. I'm minding my own business, when all the sudden something hits me and causes damage. I turn around, and... OMG! IT'S JASON McRAY!! I seriously thought it was you, dude. LOL You hit me a second time, and I thought you were just fooling around, but now I was starting to get pissed. "Was it something I said on the Official modpack Forum?" LMAO Somewhere around this point, I realized it was Headcrumbs (which I didn't even know was in the modpack). But it was quite funny.
I bolded the part you said, because I think this is what happened on the server I play on. You see, I don't work so I can play 18 hours every day (and usually do). I was progressing way faster than the other players and I do think they got kinda jealous or something. When I made the NanoSuit and began flying around, that was the last day I saw another player on the server, about 10 days ago. It really does appear as if they got fed up with my progress (and their lack of progress) and quit. sigh