In the last few days I had several meetings and I am currently finalizing a partnership with a 28nm ASIC chip producer (NDA, so I can't reveal much). It will bring us opportunity to add more than 30GH/s per BTC before then end of January.
30GH/S at current difficulty would give less than 0.12 BTC in 6 months (considering a very low increase in difficulty of 40% per month) if you start mining right now.
First off. The last 2 increases have totaled 45%, This increase is going to be 15%ish so it looks like the increase might be beginning to level off at least temporarily.
30ghs with an average increase of 15% yields 1.71XBT in 6 months. Even 40% nets .88XBT in 6 months. Not sure how or where your doing these projections, but they are way off.
http://goo.gl/dw5UrE Your "very low" estimate is only a few % points off from our largest increase of 46%. You can't use extremes either high or low when projecting long term.
Second, Pyramining is significantly different than mining at home.
All deposits get to share in the spoils of new/better/faster hardware.
He said 30ghs/XBT on nov 1st, but since then XBT has quadrupled. We will all benefit as XBT rises and costs per GHS drop.
XBT=BTC I am going to support the push to get XBT recognized with a currency designation by using XBT in place of BTC as often as I remember to. Its gonna be a hard habit to break :-)