Sure, you can do what you want, and level of commitment and how to demonstrate such commitment to yourself with possibilities of adding value are within your discretion about how to do it and how much to do it. From my perspective, there seems to be some value in striving towards some committed behavior on at least a weekly basis, and sure maybe your budget does not allow you to buy bitcoin every week, yet there still could be other ways to reinforce commitment towards accumulating more bitcoin.... unless you think that you are doing enough to be only buying once a month, for example.. Those seem to be choices, and yeah, sometimes we might not have time, since we might have some kind of a job in which we are earning money and we consider that to be helping us in bitcoin, or maybe we are spending 4 hours every week studying some topic and/or reading from some books that we consider to be helping us in regards to bitcoin (perhaps even indirectly through self-development kinds of activities).. Maybe we are doing pushups..and we have mentally connected that towards bitcoin (even though surely it seems to be a indirect connection)... ..
There are many ways to invest in money apart from saving money from your salary for investing in Bitcoin. We can participate in signature campaign to earn Bitcoin per week and they can help us to build an adequate portfolio over a period of time. Doing push-up will improve your health and reading book can may increase your intellect but to improve your financial status one has to invest in Bitcoin.
Some people might feel that they are better at doing some menial work and feeling like if they do that work, then they earn more money, so if they work 10 hours extra each week, then they likely would be able to generate more money to buy bitcoin with that extra time spent on that menial work. Like I already mentioned, others might feel that they are better at reading some kind of a book or article.. or perhaps spending time reading/writing forum posts.. (am I talking about anyone in particular?.. hahahaha)
Of course if you have enough bitcoin then you can spend more time on Bitcointalk.org reading posts rather then working extra hours to gather money for Bitcoin investment. In that case, you also not pay any attention to signatures campaign since they are don't pay according to your expectations.
You are exactly highlighting the rationale for getting started right away, yet there are a lot of people who might hear about the rationale and they might even say that they believe in the rationale, yet it still seems a more important thing is to begin to act.. whether it is setting up accounts, or researching from where to source bitcoin, and the preliminary actions should end up with purchasing some bitcoin and then putting a plan into place to be able to buy bitcoin every week or some other reasonable time interval.. since if action to buy does not end up getting included into the outcome, then there will be nothing to show for the good intentions to buy or even the belief that buying is important.. and surely, I am not even saying it is easy to put a plan into action, yet it likely becomes easier to continue to buy bitcoin on a weekly basis after making yourself do it every week. ..and yeah, maybe some people it is impractical to buy every week for logistical reasons, so they need to do what works for them, yet action to buy seems quite central for both the no coiner and the low coiner.
I can relate another example here. I wanted to buy a car that costs 1 Million Pak rupee in 2010, I started accumulating money for that in 2010 in 2012 I have 1 million but at that time price has gone up to 13 million. So prices in case you need to buy a car or construct a house, prices are always going up and it's difficult to arrange Lump sum money. Most people that's why go for car finance through banks and pay extra money to banks. To me rather then accumulating money in bank to buy a car or construct a house, its better to invest in Bitcoin that can give you good profit after 5 or more years.
We can learn swimming by actually doing it. We can learn whether we need to invest more in Bitcoin by actually getting started with it. If we start from somewhere only then we can figure out whats our position in bitcoin. Staying away and not actually investing wont be of any use.