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.
This is so true. We cannot make conclusions on people progress in investment because we dont know how long they have been accumulating and the amount they have in their portfolio. In the example you gave, that a user may have accumulate 15 BTC. It is quite a good amount of Bitcoin and he may choose to either slow down or keep investing depending on his income (if he still earns so much to keep up the same amount per week), or target. Perhaps his target might be to have 20+ Bitcoins in his portfolio. And I think this is where buying on dips becomes a preferred strategy over dca.