videos to sub ratio means absolutely nothing as rachel said.
its horses for courses. i get annoyed when a youtuber i love only uploads rarely (hello jontron) i think if your into something then you want to see more naturally
i am a crazy person. i am uploading 2 videos a day on average ish. one day i uploaded 10 videos

it depends entirely on what your making. doing a written out comedy skit or documentary. then people will expect a slower upload scedule. people who follow lets plays usually do so on a daily basis (or every 2 days) because people like to follow along and they are easy to make
Vlogs are slightly different. if your making too many vlogs then your going to have less interesting things to say/show in each one because your having to fill the content. there is only 24 hours in a day afterall
i have done very well even with my heavy upload schedule because i was making lots of mini unit guides for a game. and people wanted to see them all
with a heavy upload schedule yeah you might lose a few subs. as some have mentioned. a cluttered subscription feed. i am building my channel on the fact my audience watches me for multiple different types of content. so they can just not watch the ones that aren't relevant to the game they are playing