At that time bitcoin was worth around 10,000/20,000$ and a FUN was equal to 50 satoshi (1 FUN = 50 sat).
Each Spin wheel has 4 prize categories, considering that the weighted average is of the common ones: satoshi, points, tickets, about 1/3 are tickets that in fact do not offer, except special cases of winning, earnings to the user. so 66% remains between satoshi and points.
Always at that time each common prize was equivalent to 50 satoshi/points/ticket, so let's say we got the prize of satoshi we had: 1 FUN = 50 sat, 1 spin = 50 sat, so a ratio of 1 (50:50).
Today we find ourselves with a bitcoin value 3/5 times higher and a FUN value 12 times lower, if we look at the spin wheels at the current value a common prize is 17/18 sat, while we have a FUN value of 4, so we get: 1 spin = 18 sat, 1 FUN = 4, whose ratio is 4.5 (18/4).
This means that the site must pay more than quadruple what it initially paid with the spins and obviously it may no longer be sustainable.
2/3 of the wheel prizes might be satoshis and points, but they changed the odds so that you win the 500 and 5000 prizes much less often. This effectively led to a more than 90% decrease in total cumulative rewards over time.
Initially, for every 1000 spins we would be expected to receive 50 sats*300 + 500 sats*20 + 5000 sats*13 + 50 rp*300 + 500 rp*20 + 5000 rp*13. This would be a combined total of 180,000 sats & rp.
Today, for every 1000 spins we are expected to receive 18 sats*330 + 180 sats*2 + 1800 sats*1 + 18 rp*330 + 180 rp*2 + 1800 rp*1. This is a combined total of 16,200 sats&rp.
The average cannot be done like this, the spin has 4 types of prizes:
1) common (15/50 Sat/Points/Tickets)
2) uncommon (150-500/1500-5000 Sat/Points/Tickets)
3) rare (1/5/50 Golden tickets)
4) special (500$ giftcard, Iphone, Rolex)
Point 4 has an extremely rare probability, it is like winning a jackpot of a national game/lottery.
Point 3 has a probability of about 1%.
Point 2 has a probability of about 3-4%.
Point 1 is the one that comes out with a probability of about 95+%, of which as said 1/3 are tickets.
So we need to calculate a weighted average of point 1, with some exceptions of point 2 and extraordinary 3 and 4.
So if at the beginning 1 FUN was 50 sat, buying the maximum membership of 500,000 FUN we had a cost of 25,000,000 satoshi, with an annual return from the spins of 200,000/300,000.
That is from 1/83rd to 1/125 of the investment.Today a 500,000 FUN membership is bought with 2,000,000 satoshi, if they continued to give the same number of spins, whose municipalities have a value of 17/18, we would find ourselves with an annual return of 63,000/70,000.
That is from 1/31st to 1/28th of the investment, that is over 4 times what it paid before, for the site it would not be sustainable.
I hope this is clearer.