To answer the "big picture" question, I have well over 2000 processed films (over 70000 photographs) and of those around 0.8% of the photographs are on the database, so there's plenty for me to go at this winter.
On a trip to Florida earlier in the year, I shot 30 films (30 x 36 = 1080 photographs). None of these have yet been uploaded because there's nothing "urgent" in amongst them. I may upload a few of the really nice ones eventually, but probably no more than around 1% of the total.
On a more recent trip, I shot 50 films (50 x 36 = 1800 photographs). I will upload some of these pictures sooner rather than later, although probably no more than 50 (around 3%) despite there being a number of rather "rare" subjects in amongst the results.
Don't take this as a moan, but I think part of the problem newer photographers here have is that they expect to upload a high proportion of the stuff they shoot rather than just the absolute best or most interesting, and thus their expectations are not met. Or they just shoot one picture of a subject and don't get the best angle, etc, but still upload it. Same result... Just take a look at the figures the regulars are coming up with and its fairly obvious that only a fair proportion of photographs taken make it onto this database.
I now mainly upload older pictures or fairly rare subject matter - we're told that its easier to get rare subjects accepted, so this is the easiest way to maintain a high acceptance rate!!