It doesn't necessarily have anything to do with being in a comfortable financial position - I speak from experience, so don't take offense, but your comments scream to me of someone who might panic sell. That's not a slight at you, so don't take it that way, it's human nature & I've done it, and not doing it in the future is one thing that is of the utmost importance to improve my long term returns...
You're in a stock, it's going great, and all of the sudden in the matter of 2 weeks it falls 15% - human nature makes you panicky... So when you say something like "if it falls off a cliff, I'll dump it," I'm thinking there could be a panic sell waiting in the wings. Or "I hate being in this position," etc.
This goes back to always being prepared for what you do - hypothetically, AMZN drops $100 tomorrow and the sky feels like it is falling, do you impulsively sell something you love, then regret it later and buy back for more? I've done it, I'm trying to take emotions of out of things, that historically has been my biggest downfall (along with greed, both of which I've spent years trying to address and am finally getting better at it) - it's hard/painful when you're investment sinks 20%, your mind says "stop the pain!"
That's simply why I say have a plan; think about 5 different scenarios that can happen and how you'll react.
Anyways, didn't see it discussed in here, but the second this dropped today, AMZN turned around hard... Props to Bloomberg for stemming the selling:
https://www.bloomberg.com/news/articles/2018-04-03/trump-keeps-heat-on-amazon-over-postal-deal-as-stock-languishes