Irrespective of who you are Bitcoin has made it easier for whoever is interested to DCA no matter how big or little your income is, investing in Bitcoin is a very good step in one's life. In budgeting for the month you need to be very careful and determined to invest so that it will not affect your duties and emergencies towards your relatives from your income.
The reason why some persons finds it to invest is because of the way they planning and budgeting, also your management strategies, don't spend money on unnecessary things not needed at all or for that time, some persons find it difficult and are not used to investment from their income ,those kind of persons no matter how you convince them, they will not, but some have it in mind but manage their income before you know it the money is finished.
For the average and the poor Considering 5% - 10% of your income is more better to DCA anything above that can be dangerous to your livelihood because you have alot of responsibiliy for the month to meet. Saving within these range is comfortable
Saving 30% and above of your income is good for persons with a very fat income also it depends on the individuals ,it is easier and better to invest from small and you grow bigger because investment has to do with your mindset and been knowledgeable about the business ,so it is better you save acaccording to your income and what you are comfortable with in investing in DIP and HODL.
In these ways you will be able to save for a long period of 10 years and more without affecting your monthly responsibilities.