And you know this how? We have barely skimmed the surface of our own solar system let alone the galaxy. Why just a little over 30 years ago, they discovered the rings of Uranus and Jupiter and the largest moon of Pluto, Charon. Pluto has 3 known moons and there may be more once New Horizons reaches it in 2015
Ceres, was considered a planet as little as 130 years ago. Neptune’s rings were not discovered until 1989. Saturn was thought to only have around 19 moons as early as 1997 there are over 53. We are making more and more discoveries every day.
Back the 70s it was thought that Jupiter had only 13 moons, it has over 63 and counting.
The new planet Gliese 581g (easier to write then pronounce) is 3 times the size of earth and its year is only 37 days. As far as it not having a moon? We don’t know that yet.
Sedna, Makemake, Haumea Eris and other objects in the Kuiper belt were only discovered in the last decade. Pluto has been demoted to a dwarf planet because of all these recent discoveries,
Planets the size of earth are much harder to find, but they will find them.
There has only been 490 or so exoplanets discovered to date.
So to say that most planets don’t have the same conditions as earth is a bit futile. It’s only a matter of time. As you stated odds there are quite a few. I would say the odds are there a millions upon millions.
By the way if you want to see something cool. Look out at the southern sky around midnight. The brighest star in the sky is Jupiter. You can see the colours of the planet and the 4 largest moons. Of course you need a telescope, I look at it every night. Its amazing.