Neteller drawing +EV?

[Lestat]

I tried a search, but couldn't find anything. Can someone tell me which option has the highest EV?

Weekly Draw
Prize: $500.00 USD
Total Entries: 41883
Cost to enter: 1000 NETPoints

Bi-Weekly Draw
Prize: $1000.00 USD
Total Entries: 45522
Cost to enter: 2500 NETPoints

Monthly Draw
Monthly Jackpot: $3000.00 USD
Total Entries: 94545
Cost to enter: 5000 NETPoints

At first, I thought it was the monthly draw, because the prize is 6 times greater than the weekly draw, with the odds only twice as worse. But it also costs you 10 times as much to enter. Can anyone show me how to figure this out (along with the answer)? Thanks.