Managing investments with 50% of salary will be the most difficult task and can be risky. Whether your income is low or high, your expenses will be determined based on your income.
Yeah sometimes it could be very challenging for someone to use there 50% monthly salary on there Bitcoin investment but however looking at the brighter side of it it could be a very nice idea if someone could use there 50% monthly on Bitcoin because it could even help to facilitate the accumulation process but if only the investors will have the conviction of achieving there investment goal using that method they would be motivated and consistently sticking to that methods, so actually is really not a bad idea because determination is just one of the things you need because it will enable you to make use of the remaining 50% very judiciously so that you Will not run out of funds, although is not every investors that can use there 50% on investment because of there pattern of spending.
The demand of a person earning $200 a month and the demand of a person earning $2000 will not be the same.
On the contrary there are some situations were the demand or rather the needs of someone who earns $200 monthly will be even more higher than the person who earns $2k on a monthly basis so don't misunderstand that because responsibility differs, so it doesn't necessarily mean that a higher earners has more needs than the smaller earners, so it all depends on the responsibility or rather things they engage themselves into.