I can live comfortably with 200$ per month in my country, with 400$ per month I can feed two people comfortably, but I am making less than 150$ per month with my job, I am participating in a signature campaign, hoping to make some good money out of it and invest the money in Bitcoin, I can hold till next green market, no problem.
I don't have any problem with what you are saying, and it sounds like a pretty decent plan to the extent that you are able to live comfortably and also invest into bitcoin over the medium to long term.
Though I personally get the sense that you are thinking too short-term, especially if you are considering ONLY being able to invest into bitcoin "until the next green market," so then I get the sense that you are thinking in terms of cashing out into fiat rather than potentially benefitting from more of a long-term plan, such as 4-10 years or longer or even 20-30 years, that would allow your investment into bitcoin to sustain over a longer period and also to potentially compound upon itself.
It's not easy, except maybe if you are suggesting that you are able to completely live off your regular fiat earnings with O.k. - or acceptable comfort, and something like $150 per month is enough for you, so then whatever that you are able to earn from various signature campaigns (presumably only one at a time), you would be able to hold that in bitcoin and to build your bitcoin investment based on whatever amounts that you are able to get from signature campaigns.
There also could be ways that you search for ways to increase your other income that you make beyond $150 per month in order to increase your investment into bitcoin, and sure these are personal choices, and sometimes there are not jobs that pay very much.. so sometimes there are not too many opportunities to figure out how to earn more.. but if you found another job that pays you $500 per month (as a supplement), then that could potentially get you $125 per week more into bitcoin, and thereby help you to build your investment portfolio, so if you were able to build your bitcoin holdings up to 1 or 2 bitcoin in less than 10 years, then you may well be able to do pretty well with that.. even though of course, there are no guarantees about how any of this will play out.. but still bitcoin does seem to be a possible way that anyone is able to potentially build his/her investment with the passage of time and be able to profit way beyond expectations that would have come ONLY through fiat earnings and other traditional investments...
Each of us has to make those kinds of choices regarding how much we believe that we can earn, how much we should invest and if there might be better ways to either increase our earnings or to choose how much we need to live and if some delayed gratification might help us to build our bitcoin holdings and whether it might be worth it for us to even have a 4-10 year investment timeline or maybe even a 20 year to 30 year investment timeline.