Wanna do the genesis mining but they don't have any btc hash to sell.
How much do I need to make profit on hashflare? Did anyone try it out?
You don't need "How much", you need "How long", because no matter how much you pay for them, the profit depends on your investment, you pay "much" you get "much".
Just make sure you don't invest on the wrong boat, alt-coins cryptomining is very unstable nowadays, just go try bitcoin for your 1st time.