It could work, this is how traditional lotteries works, doing the math:
0.01 btc * 15000 users = 150 btc .
So, the winner receives 100 btc,
20 guys get 2btc = 40 btc
100btc + 40btc = 140 btc .
I suppose that the 10 resting btc are your profit?, right

Yes, something like that - but my question is , is it not enticing enough to invest $0.01 to win 100 BTC with appx 15,000 contestants participating.
I've not played much lottery, neither an active user of Bitcoin - but given the fact that everyone trading is looking for a big return and risking their money anyway, a contest like this if not anything could be a lot of fun and excitement.
Would you not try to win 100 BTC with a 1/15000 chances ?