I'm not a doctor but I know enough that I should take responsibility for my own health. What other people choose to do to their own bodies and what pre-existing conditions they may or may not have do not absolve me from taking precautions over my own health and well-being. If I fall sick because I irresponsibly took ED drugs without prescription, I can't very well say "It's their fault!" can I? Besides, what good would it do me.
Moreover, suggesting that the dosage be increased to 100 mg when the 50 mg doesn't work is really playing with fire, IMHO. There may be other underlying conditions as to why the lower dosage isn't working which need to be investigated.