I actually did that with part of my altcoins that I have purchased long time ago. It seemed that they were not my best purchases and I was (and still would be) in a loss with them. Selling them when Bitcoin was at $85k was my best decision, as Bitcoin price increase let me close my purchases with 0 instead of minus. For example I still had NEO purchased years ago at $60+. I used to have EOS that cost dollars, and now its value is less than a dollar. Selling altcoins for BTC was not a temptation for me, but a solution.