Waiting and piling up the cash in fiat before you buy is totally the wrong approach if you ask me because Bitcoin isn't a stable coins and you can't expect the price to sit around and wait for you to gather all the money first before you now use when you are satisfied with the money for investment. The right thing to do is simply to keep striving to accumulate just like you have stated with the little earning so that you can meet up with atleast the lower price because you can't tell when the price might go up or even down.
That's right, collect cash first before buying Bitcoin, of course this is very wrong, we can skip buying when the price is down and it would be better if we continue to make purchases whenever we have funds that we can use to invest in Bitcoin and do it consistently in order to achieve satisfactory investment targets from the results of the investments we make.
Make a plan of how you will invest, if investing with accumulated money you must wait for the dip. But if you keep investing regularly using DCA method then you can invest monthly or weekly with your income or salary. So it only depends on the investor whether his investment is long term or short term, but Bitcoin investment is better to be long term. Because the longer the Bitcoin investment, the higher the benefits and the lower the risk.
Yes it's true, I totally agree to your sentiment bro, it's more ideal to invest in Bitcoin when you have a source of income coming in on a regular basis, because on that note, you can accumulate Bitcoin true the dca accumulating strategy, according to how much you can afford while having your emergency funds kept aside, but if you decide to invest in Bitcoin only when you have funds, you wouldn't be consistent in your accumulating process and that might hampers you in having a good stash of Bitcoin in your possession, and you might also temper with it, if you don't have a source of income that can take care of your basic needs, in your daily lives.
So in all this, it's very much necessary that as you are investing in Bitcoin through the DCA method, you should have it at the back of your mind that it's only for long term purpose, because it's only that way, you can fully reap the full dividend of your Bitcoin investment.