Just wondering if ya'll have a typical formula you go by or a certain X percentage profit or loss. 

I've been playing around with coins for just under a month now. $23750 total investment and currently up just under 10k in profit. One of the coins (IOTA) has gone up about 288%.  Obviously it would suck if it crashed but it would equally suck to sell if it continues to grow.

Just wondering what a lot of you folks do. I'm considering investing another 25 or 50k into coins. Ideally I'd like to net 15k a month off them but I know that may not be realistic on a monthly basis.