Yes, that's the way it works i think- the pot of money is shared between the winners. if you choose the most popular numbers and they come up you will not win anywhere near as much as you might have expected. As all numbers have an equal chance of coming up you should choose the least popular numbers in order to maximise any winnings
There has been research on the most popular and least popular numbers. If you want the least popular numbers avoid birthday numbers (1-31)and 44 (the number that seems to have come out most last time I checked). I recall 34 was the least popular.
But I've never bought a ticket!