Okay sorry, I missed Pyramining and just thought it was a pyramid. But I would think this is bad idea:
1) You have to trust Pyramining.
2) You have to trust Cryptostocks.
3) You have to trust pyra-proxy.
4) When you buy the stock (it should be a bond, not a stock) directly through Pyra-proxy, your BTC are invested. But when you buy it from someone who is SELLING it, then your bitcoins invested are NOT contributed to pyramining and will not increase dividends generated.
5) The contract mentions no such thing of a buyback program or an askwall. This means that if you want to sell, you will have to sell for less than what you brought for unless pyra-proxy decides to start a new program not in the contract.
I'd suggest investing in Pyramining yourself as the risk for this is orders of magnitudes higher. If you need a referral link to sign up, try
http://www.pyramining.com/referral/zfhd3gstq or
http://www.pyramining.com/referral/a4g3kdnhb