Not really sure how many winners will share the prize, but maybe you can try with few hundreds dollar if you are interested.
There will be 2 benefits if you can wager alot, first is the chance to win one of the prizes in the race and increased your VIP level to receive the revamped reward.
Shuffle.com is already 1 year old casino! They have announced here after 7 months of launching their casino. Anyway, I think they will distribute the prizes to the top 100 participants only. Judging from the current monthly race of Shuffle, there are a decent number of big players. It may not give a positive outcome if anyone wager to get prizes from the wager contest, and to get the rewards of level up.