It's a decently good example, and it even shows that BIG players will frequently have to go through a kind of process in which it takes time to become profitable, even when MSTR/Saylor started out as profitable with his first purchases for himself and for his company to be in the $10k price territory.. but they continued to buy, and even bought really large amounts in the $50k arena.. which surely brought their costs per BTC up a lot.
I just gave this example, that companies with big money can afford to make even such blunders and still be able to form a good average purchase price.
If I did the same, then a small investor like me would most likely be in a much worse situation than Sailor with a Microstrategу, which is why I try to devote a lot of time to analysis and determine for myself the levels up to which I can buy to get maximum profit.
In regards to lessening or stopping your buys when the BTC price is above $30k, I am not sure if that specific idea is good - even though surely there can be some value in terms of buying more BTC on price dips and perhaps buying less BTC when it surges up in price a lot.. but then there becomes a question regarding whether the current price (or above $30k should be considered a surge, or what might be a fair characterization of supra $30k prices these days).
Buying on dips is good and perhaps you can try to strategize in order to not be buying on the extreme price rises and then just waiting for further dips; however, if the price goes above certain price points, and then does not end up dipping sufficiently to satisfy your later "buys on dips", then what are you going to do? especially if you might have cash regularly coming in, then where are going to put that extra cash? just let it build up? or maybe you end up panic buying at much higher prices? Maybe you allow your cash reserves to build up to a certain point and then rethink the matter? that would not be a bad approach.
When the price exceeds 30k I continue to accumulate capital that can be used to buy again in case of a correction if the price of bitcoin falls again. If it doesn't, then I will continue to raise capital for further investment, possibly for the next bear market. I assume that the next bear market may not be soon, and perhaps it will be significantly higher than the current levels, but I chose this strategy, I hope it turns out to be correct. I do not rule out that I can change something, but I'm used to not changing initially strategies.
So you are in dangerous (and maybe even out of touch irrational territories?) if you are wedding yourself (and your ideas) to strict thinkings of absolute BTC price thresholds (like $30k) rather than attempting to consider your price thresholds in terms of a somewhat more solid bottom indicator, which I would consider the 200-week moving average to be decently good (even though moving target) of a solid bottom (good value) indicator.
This is definitely a reason to think, maybe if we spend a very long period in the current range and I accumulate a good capital during this time and see that bitcoin is still in a flat, then I will understand that there is still an accumulation phase, after which bitcoin will definitely grow, then I will decide to buy more bitcoin.
Not so long ago, the price had already exceeded 30k and I was just saving money, but after that a correction followed and I continued to buy. I do not rule out that this may happen again in the near future.