I disagree. You are the one who reported the one day performance metrics of TSLA vs. your recently acquired stocks. If you thought one day performance metrics were "utterly meaningless" I wouldn't have expected you to report the numbers as if they meant something.
I think you misunderstood my post. I've been accumulating non-Tesla shares for a long time, from before I started accumulating Tesla in 2013. What happens is one day is not "utterly meaningless." It is simply what happens on a single day. The curious thing was that that particular day was illustrative of how my portfolio is not perfectly correlated with Tesla. There are days when most of my stock move in the same direction as Tesla and days when they do not. On a longer timescale this is very helpful. At times when Tesla has done poorly, these other stocks provide liquidity to accumulate Tesla on the cheap. It is especially helpful if these stock are not highly correlated with Tesla because they can hold more value when Tesla is down.
Let's make this a little more concrete. Suppose you own a portfolio of exactly 1000 Tesla shares at $600/sh and nothing. Now suppose the share price pulls back to $400/sh. What do you do? Many of us would hold on tight and wait for the price to return to $600. Great. This happens because Tesla is an awesome stock and will keep growing well pass this. You've still go 1000 shares of Tesla.
Ok, now suppose you've got 1000 shares of Tesla (starting at $600/sh) plus $200k of other liquid assets. Your portfolio is $800k and 75% of it is Tesla. You decide you like this ratio and try to stay close to it. Now again Tesla pulls back to $400. The value of your portfolio is $600k. Now you have the opportunity to liquidate $50k of your non-Tesla assets and accumulate 125 more shares of Tesla. When the price of Tesla recovers you've got 1125 shares worth $675k plus $150k of the other stuff along with appreciation (which we'll ignore. So conservatively when Tesla is back at $600, your portfolio is at $825k. You could hang on to the 1125 shares, but you would in weaker position to accumulate the next time Tesla has a pullback. Or you could rebalance to 75% which would level you with 1031.25 Tesla shares (more if your other assets are growing).
So rebalancing is a strategy for growing your Tesla position over time both in shares and dollar value. If you are confident that Tesla will keep growing in the long run, then it makes sense to rebalance whenever the share price retreats. You're confident in recovery and wish to have an even larger number of shares in the future.
The thing that I used to get hung up on is that I wouldn't rebalance when Tesla shares recovered value. Basically my only means of refreshing non-Tesla assets was to earn money at my job. When my income was high relative to my portfolio, this worked fine. I'd just save up more cash, and accumulate a few share here and there. What has changed this year is that the value of my portfolio has exploded, thanks to Tesla, SolarEdge and other stocks. The size of my portfolio now dwarfs my annual salary. My income is insufficient to rebalance my portfolio. So I have come to terms with needing to harvest gains on my high flying stocks so as to be able to seize on buying opportunities as the happen. It turns out that being able to accumulate a few more Tesla shares under $400 over the past two months was a really good thing. At this point I must harvest gains to fund such opportunistic buying.
As I pointed out, I am now in a good position to enjoy whatever happens next for Tesla. If the price goes down, I can seize on the opportunity under the belief in the long-term promise of the stock. Or if it is goes up, I can make good use of that opportunity too and have other stock positions I'd like to build up. I don't have to predict what any share price will do next. Rather I'm prepared to respond to whatever opportunities come next.
