What is a 2nd chance entry?
While I await your answer I'll give some answers based on guesses:
Assuming there is a drawing of slips of paper with names on them. Assume the drawing is open for entries for a month and then closed.
From your "already determined" phrase I assume there are a number printed and made available. Let's say 100,000.
But not all will be used. Let's say 50,000 are filled out and turned in.
Assume the slips are drawn at totally randomly after being well mixed.
The odds of any one being drawn are now 1/50,000. It doesn't matter if it was put in first, in the middle or last so spacing makes no difference.
If you enter 100 out of the 50,000 your odds are now 100/50,000 instead of 1/50,000.
However, let's say each entry costs you $1. And the prize is $20,000.
That means that before the draw each ticket is worth 20,000/50,000 or 40 cents. That means on average you will lose 60 cents each time you buy a ticket.
If you buy 100 tickets you are most likely to lose 60 dollars instead of 60 cents.
That is all before the draw. At the moment of the draw 1 ticket becomes worth $20,000 and all others are zero. The average is still 40 cents each.
Before the draw you are buying 4 dimes for one dollar. If you think that is a good idea or can afford to make that deal once or 100 times then go for it. But be very clear: You are buying 4 dimes for one dollar!