The longer that a member has been accumulating bitcoin, then he might not need to buy all the time anymore... so it can be difficult to know if a guy might have reached a point of accumulating enough or more than enough bitcoin.
Even the case of LGD2Business, he could have had been with an income of $30k per year and ONLY investing around
$50 per week for the past 10 years, and he may have over 15 BTC if he had been ongoingly accumulating bitcoin at that rate.. so sometimes the size of the bitcoin stash can start to affect how aggressive a person might be in his bitcoin accumulation, and based on his BTC stash he might ONLY buy during dips or during dips of a certain size.
Sure, the more someone has been accumulating Bitcoin, the little pressure they will feel to continue buying at any time because they already own a big holdings. Those types of people can only accumulate more during dips because any small amount you put in today can turn into something big tomorrow. Your example shows how some people can end up with a lot of amount if they maintain to their plan.
Furthermore, some people who are still in the early stages of accumulation find it different because they have not reached that level, but buying using the DCA method is very important for newbies because it allows them to focus on building their portfolio without waiting for market to change. It all is based on where everyone is with their investments, those who have plenty enough will be able to wait for dips, while those who still want to grow their portfolio should continue buying according to their plan.