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Mate, I disagree with what you said about buying bitcoin with a gas fee on a centralized exchange; bitcoin does not have a gas fee if you want to buy it on a centralized exchange.
The only time you will pay a gas fee is when you want to withdraw your bitcoin from the centralized exchange to your noncustodial wallet or when you want to send bitcoin to a family member from your noncustodial wallet. If you are accumulating bitcoin on a centralized exchange, you can withdraw your bitcoin when you have accumulated bitcoin worth $500–$1,000, so you will pay for the withdrawal fee at a time.
Fuck gas fees.
Bitcoin does not have "gas fees" under any circumstances.
That is stupid-ass shitcoin language.
When a person withdraws from an exchange, there can be exchange fees and transaction fees.
When bitcoin is transacted peer to peer and without any intermediary, then that would just be transaction fees.
Of course, sometimes people might believe that they are transacting peer to peer, yet if they are using some kind of custodian, then there could be some fees that are coming from the custodian rather than serving as pure transaction fees.
The reason for waiting for higher amounts for withdrawal (such as $500 to $1k) is not merely for saving on possible exchange fees, but also to attempt to engage in preventative measures in regards to UTXO management. Guys can choose lower amounts for their withdrawal amounts, yet they still need to attempt to account for their own ways of buying BTC, if they might be buying $100-$500 at a time, or maybe they are ONLY buying $5 to $50 at a time... so there may well be some value in terms of not withdrawing every time they buy BTC, especially if their transaction amounts are towards the lower amounts, yet each person needs to balance these matters for themselves and figure out the various trade-offs in regards to present UTXO management and also attempting to understand how UTXO management might evolve in future years, including when they might be wanting to transact with their UTXOs later down the road, and it might be quite costly for them if they were to have several thousands of dollars in BTC, yet many of them are very small amounts that cause them to be very expensive to either use or to move.
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I agree with you on this idea of not looking at your portfolio before buying more bitcoin because as long as you are using DCA method to accumulate regularly, there is no need. What I do is that, I write down how many Satoshi I acquire everyday week and at the end of the month, I sum it up. This is how I do every month so that I don't start thinking that I have accumulated enough, or when the price pumps, I don't start thinking of the profit in my bitcoin investment.
Sometimes over looking at your portfolio, can give you false hope that you have accumulated some good quantity that you might be tempted to take a little profit, if you are not disciplined at stay focus on your bitcoin goal. As long as I am DCAing regularly, I know that my bitcoin portfolio is increasing weekly, and that is the joy of buying regularly.
Personally, I think it is a good idea to attempt to keep track of your costs per BTC, even if you are not going to be tempted into selling them, but hey guys can do what they like in terms of keeping track of various aspects of their BTC holdings.