Yes! I have and I learnt a big lesson. I was panicking that the prices of BTC & ETH were running high last year and I never had money to buy either coin feeling I may not be able to buy then any more. Eventually, I was able to buy some quantity of ETH January this year, and immediately I bought, the prices started dropping drastically. I bought when price was still $1,200 per coin, since then the price has never gone above $1,200 instead it kept dropping to what it is today. If I had waited a little more, I would have been able to figure out that the price was dropping and I wouldn't have made the decision of buying.