i put into it when it was $600, and after I got above the $100 mark, i removed myself from usd$ trades.
I've been rotating high/low with btc/eth, btc/ltc, and btc/bch and have made $30 from that in just this past week... which is why yous haven't seen me much lately
I made an excel (google sheets) program where I list my trades, and it helps make sure that I am less likely to buy above my previous sell/avg, and that I'm less likely to sell less than my previous buy/avg. all I do is input my trades, and the rate I'm expecting to buy/sell, and it tells me what limit buy/sell to make.
when I attempt to sell too low or buy too high, I have different cells either become bright green to say 'OK!" or bright red to say "NO"
I also have it check against an aggregate of multiple other exchanges than I use (gdax) so that I might have a heads up if something will be rising or sinking