Levels of aggressiveness should not be measured in absolute terms, but instead within the amount of discretionary income that you have, and so yeah a person with higher income could buy more BTC but that does not necessarily make him more aggressive than someone with lower income and who might be using all of his discretionary income to buy BTC. Maybe we can take some extreme examples.
One guy has $100 per month of discretionary income and he uses all of it to buy BTC.. This guy is quite aggressive and maybe even bordering on over aggressiveness (especially if he miscalculates his expenses or if he does not have reserves in place).
Another guy has $2k per month of discretionary income and he invests around $100 per week into bitcoin, which might be considered moderate and maybe even whimpy.
if you received $1500 and you invest $300 each every week, making a total of $900 per month left with $600, that is a bad aggressive Investment and surely the person is over doing it. because your bitcoin Investment should be done in a manner that you will not over do it. It will definitely affect you or Put you in a tight corner. If you Invest $900 on bitcoin how much will you use for feeding and running family expenses? Or how much will you set aside for emergency and reserved?
the scenario you've painted here depends a lot on the individual that's involved, but for most cases, I think that investing $900 while using $600 to run your monthly expenses isn't a bad idea. If I tailor this down to my situation where $600 is equivalent to N780k of my currency which to be honest is enough to take care of an average household for at least three months, then, it's not a bad decision if someone that earns such amount of money within a month decides to make such form of aggressive investment. Note that it's improper to spend too much on your house keeping just because you're earning more. As long as you have a future plan as to what you want to get out of your Bitcoin investments, then it's totally proper to go a bit aggressive most expecially in cases like what you've painted here when it appears as though the resource to buying aggressively is at your disposal. And it's necessary to note that you don't have to always make provision for your emergency funds every month. It could be that for three to six months , you could allocate a certain amount those goes into your emergency funds after which you stop making such provision and the rest earnings that comes in goes directly into your house upkeep and your Bitcoin investment. And thier might even be times when you wouldn't exhaust your upkeep money and would have to role it over to the next month giving you the ability to buying your Bitcoin at ease.
The point of the matter is that don't over invest what you can not afford to lose that will make you to sell you bitcoin HODLing down the road because of not having a discretionary fund to back you up.
if you're still looking at Bitcoin investment as a possible ponzi scheme that should be invested into with funds that's not useful to us, how then can you HODL for a long time? And would you even get the best benefit of investing into Bitcoin?
Untill you get this kind of mentality out of your mind that makes you believe that you have to invest with an amount you can afford to loose, you're nit ready at all to talk about buying Bitcoin and HODling it. It's okay to make adequate plans and set things like your emergency funds right so as to help you accumulate Bitcoin for a long period of time without getting pressured to sell when you should be buying but when you make it a part of your plan to invest so little such that you can afford to loose if anything goes wrong, it practically suggest that you're not investing into Bitcoin but rather making gambling with your funds and that's just pure shit.