I bought mining gear after my  btc has trippled in value:),  I don't see btc trippling any time soon so best to shift those profits to mining gear now.  Rinse/Repeat.

Ideally I wish i can use my day job money to buy gear and keep my bitcoins,. But I'm low on usd cash,  so I think it's good to take some btc profit after 3x gains to buy mining gear.