I'm not sure that the reason of "because I love making videos" is a strong enough reason to stay motivated for as long as it takes to be successful on Youtube.
There is nothing wrong with the money being at least part of the reason. After all, that's why YouTube is doing it, don't kid yourselves into thinking otherwise. For many people, money (and what money provides) is a huge motivator.
Let's put it another way. If someone is making decent money from a channel (channel A) and someone else isn't making any money but claims to love making videos (channel B). Which channel is the most likely to still be making videos 5 years from now?