So you discovered the problem with deflation...
It makes BTC good way to store value...
Terrible to invest with...

You don't want to borrow deflating currency...
Because you will have hard time paying back...
You don't want to lend deflating currency...
Because you will not receive all money back...

Buying stock=lending money in a way...
Everyone see this is bad idea...
Keep hoarding your bitcoins...
And selling only what it is necessary to sell...
Lower risk and better payoff...