You are making the classic mistake in thinking that in crypto coins that the cost of production has anything to do with the market price.
If there was no limit as to how many bitcoins could be mined, you would have a point. Production would increase, and the flood of additional bitcoins would suppress the exchange rate until mining no longer is lucrative -- and an equilibrium would be reached.
But with mining, difficulty adjusts and thus no matter how much additional mining capacity comes online, roughly the same amount of bitcoins are produced day after day.
So the amount of mining occurring (hashing capacity) doesn't drive the price, but instead is simply a reaction to price.
Because of how efficient ASIC mining hardware is, the cost of electricity is a trivially low percent of the mining revenue. This contrasts how with GPUs the cost of electricity does now (... or soon will) exceed the revenue.
So ASIC has (or will) demolished the profitability when mining using GPUs, but it has little to do with the exchange rate. (other than, perhaps, miners investing their coins to buy ASIC hardware, and in turn ASIC hardware vendors flooding the market with coins when cashing them out for R&D and manufacturing costs.)
When there is a delta (as there is right now) between price of BTC and cost to produce BTC then every new BTC created is effectively being purchased for less than market value, and as of right now for a fraction of market value. So it would stand to reason that the vast majority will be converted to $$ or other currency immediately upon creation.
It's like insiders caching in options on a normal stock, which drives price down.
This does in fact have a become a market mover to the downside if the overall volume is low enough, which it seems to be. Your statement would be true if the outside interest in BTC overwhelmed the miners influence but it doesn't seem like we are there yet.
It seems to me that other than the recent media fueled bubble, mining is THE primary factor in determining price.
I'm a miner. I don't sell my btc as soon as they are produced, and in fact, as a US citizen it would be illegal for me to do so without registering with FinCEN as a money transmitter. It stands to reason you are just making shit up.
http://fincen.gov/statutes_regs/guidance/html/FIN-2013-G001.html