yes there must be reasonable limits. It is reasonable to spend on cryptocurrency the money that you can afford to lose and it will not affect the quality of your life. You want to risk your well-being. Times of high volatility have passed, the market is becoming more Mature. By investing in early 2017, you could become a millionaire by investing in 2018, you will become a little richer, nothing more. But how much will have to wait for the moment when the market will reach the level of the January highs, it is not known. Therefore, I advise you to invest 10% of your monthly budget and do not sell your coins/tokens 23years.