It's just based on deposits
Here are the T&C
Win a Dream Holiday Terms
(i) The prizes are worth between £20,000 and £500.
(ii) A cash alternative to the prize to the value of 75% of the Holiday (excluding VAT) will be made available to winners at the discretion of casino management.
(iii) Winners will be selected via random prize draw from all confirmed entries for the given month.
(iv) A Winner will be selected at the end of each calendar month, beginning on 10/04/2017
(v) Monthly Winner selection will only take place if there are at least 30 confirmed entries into the competition
(vi) Prize is non-transferable. Value of the prizes may vary; The Casino reserves the right to replace any prizes with items/experiences of similar value without prior notice.
(vii) Acceptance of any prize shall constitute consent on the winner's part to allow the use of the winner's name, image, voice and/or likeness by the casino for editorial, advertising, promotional, marketing and/or other purposes without further compensation except where prohibited by law.
(viii) The casino’s decision regarding the award of all prizes shall be final and binding on all participants in the contest, and no queries, challenges or appeals may be made or entertained regarding the decision.
(ix) The prize is for a ten (10) night, Including Accommodation and flights worth up to £20,000.
(x) Accommodation is based on availability and seasonality to South Africa only.
(xi) Holiday insurance must be purchased by the winner before travel.
(xii) The prize is subject to availability, cannot be taken during peak seasons (Easter, July, August, Christmas, New Year) and cannot be checked or confirmed until 90 days prior to departure.
(xiii) Once dates are confirmed there will be an administration fee for any changes made to the reservation. This fee varies in accordance with the changes.
(xiv) Failure to claim the prize within 14 days winner will forfeit the holiday or prize.
(xv) The competition is not open to employees and their immediate families.
(xvi) Winner will be selected at random and contacted via email, SMS or Phone.
Entry:
To enter into the competition, a player must earn 1,000 Spin Points in a given calendar month
Spin Points are earned by depositing funds: £50 deposit = 5 Spin Point
Spin Points totals are reset at the end of each calendar month
A Spin Point is only valid if the cash account balance on each deposit has been played through at least twice.
Example – Player A deposits £100. In order to earn 10 Spin Points, Player A must therefore wager £100 x 2 = £200 before the MD Points will be declared valid.
Not only do you need to deposit £10,000 for entry, you need to wager each deposit x2 for it to count.
Plus you have to deposit and wager it within a month, because the points are reset at the end of each month
And if all that isn't bad enough.... the draw will only take place if there are 30 or more entries
still not as bad as whatever was it last time, wager billion get $20 bonus but... 
for gods sake is there a single person in this world that deposits $100 and wants to play $0,15 bets ? so not really sure who is this offer aimed at . lowrollers dont depost $100 at a time. highrollers couldnt care less for 15 cents spins... so im kinda lost :notworthy
