I mean, when you´re looking at a perfect inverse correlation between production capacity and the price of product you have to admit that it smacks of some kind of fraud. Otherwise you´re totally delusional.
Despite the fact that this is hard-boiled trolling, the exponential rise in Bitcoin's difficulty and some of the subsequent price decline can be explained by the run-up to $1200 last fall. As the price spiked up and and up to 10x its SR-Closure value of $90, people saw dollar signs in their eyes.
It was then that the true ASIC war began - people decided that, at a block reward of $25,000 or more, they could make a pretty good profit. So they ran to chip designers and manufacturers (both of which are fixed, sunk costs) and put their orders in. I believe that the BTC mining ecosystem was still feeling the effects of this up until just a few months ago.
As the price slowly slid down from $1000 to $800 to $600, declining in part due to the lack of constant buying established by Mt. Gox (and later the shock to the BTC ecosystem by its demise), these mining companies with sunk costs had to trudge on and mine at a loss (over their manufacturing costs) just to try to recoup a some of their investment.
This becomes a vicious cycle with miners dumping BTC to recoup manufacturing costs and electricity, further driving the price down. I believe that this will start to level off in the next few months. Most of the ASICs that were hastily put into production from Q4 2013 to Q1/Q2 2014 are now out in the wild and further ASIC development has been centered/centralized around a few large players like AM, ST, Bitmain, KNC. These large players, some of whom are not even selling retail anymore (KNC) are now able to self-finance their manufacturing and need only to answer to investors and board members, not customers and the public - they have a much bigger incentive to hold BTC than to sell it immediately on the market if they have enough capital reserved for such a strategy.
I do think you are correct that there are some mining farms taking advantage of China's low cost chip design, manufacturing, and miner assembly capabilities to throw up large farms to exclusively generate and sell BTC, but they are not the main driver or mining or BTC 'dumping' at the moment.