Do we really need huge money before we can do DCA? Since for me even if you have small funds you can do it. Since the most important thing out their is you are consistent with your accumulation. So any amount will do since its more important to see your portfolio will grow, rather than you wait to have huge funds before you start to accumulate.
You only need huge funds if you buy in bulk like you try to buy huge volume or 1 BTC directly.
Also its important for investor if they use their discretionary income since with that there's good chance that they won't struggle to meet their daily needs and they can continue their Bitcoin investment without getting any huge problem.
I never mean to say we need big amount for DCA rather my point is whether it's small or big it must be consistent for every week or month. Like if I decided to invest 100$ per week in Bitcoin then I must ensure that 100$ is available every week for investing in bitcoin.
Secondly why discretionary income is important is because it helps in provision of necessary funds for investing in Bitcoin. Again if I am investing 100$ per week in bitcoin then saving 100$ every week from my salary is difficult because of increasing inflation or due to some other requirement. But if I have a discretionary income like I work in a signature campaign here then I can easily generate 50$ (or more in case you have high rank) for bitcoin.