I also have some personal funds that I want to invest into Pyramining. Actually I could buy ~2.5TH/s more, but I think it wouldn't make sense right now: we would add too little hashing power with current technology. What I have in mind is to wait for the 2nd gen ASICs to be available and invest with it, for the benefit of everyone. By that time I expect that difficulty will start to stabilize. I expect it would be around February 2014. I'd like to know your opinion about this.
Good to have you back, and good to hear that you are fully committed to the project. I agree that adding another 2.5TH/s doesn't make sense right now. We need better, more efficient technology to get ahead of the curve a bit if we are going to be able to pay off past deposits.
Mining is getting a bad name as an investment right now, and I think the pace of difficulty increases will have to slow down eventually. It might not happen soon, but I think the best strategy is to start investing in new tech when everyone else stops investing.