I heard the minium to invest is 50.000$ in bitcoin mining to make some profit. So how more u will spend the more u earn.
Off topic, and incorrect. There is no "minimum" you must invest in mining to make some profit (well, I guess technically if you invest $0). It's all about how you spend what money you do invest. For example, investing $500 into a used S1 would be a very poor choice and not lead to any profits whatsoever.