It's too low if you ask me because 50% is  the half of your discretionary income and anyone who want to invest into bitcoin as a new investor should invest at least half of his discretionary income so that he can build his bitcoin portfolio in a fast pace provided that he has confidence in bitcoin. It's people who don't have confidence in bitcoin in the beginning of their bitcoin journey that can start with little amount of money and later increase it if they have built their confidence in bitcoin through their regular DCA ongoing accumulation.

It's better to be aggressively in your bitcoin accumulation when you can, than buying in a whimpy way when you can increase the amount of money that you are using to DCA weekly and it wouldn not affect you. Don't forget that it's not by how long that you have been accumulating bitcoin that matters in the long run but the size of your bitcoin portfolio. Some early investors are regretting that they didn't buy more bitcoin back then when they could afford it at a cheaper rate because they have seen the height that bitcoin have attain currently. Don't also be among those that will regret in future for buying bitcoin with only $35%-$45% of your discretionary income when you can buy with $60% without any problem.

You can also buy aggressively with DCA method.