According to your number table, if the random number is 9501-9800 then you get 2500 sat. Since the highest the random number can go is 10000, that means you have a 3/100 chance of getting 2500 sat.
Yet after 400 claims, I have never gotten anything above 650 sat.
Something seems to be amiss here.
first it doesn't depend on the number of claims you make, second the probability is however very less for 70k and there is 20-30 percent chance that you'll get anything above 2500.
This is your own random number table

How do you get this "20-30 percent chance that you'll get anything above 2500"? According to the table, 500 of the 10000 possible numbers correspond to 2500 sats and above, so that's 5% (5 out of 100) of the time.
And if something that's supposed to happen 5 out of 100 times (i.e. claim amount of 2500 sat and above) doesn't even happen 1 out of 400 times, then very likely something is wrong.
The table is merely to make one understand what he/she will get on rolling a random number. the probabilities however is different for claims. we are planning on changing the algorithm after this sunday and hopefully this time we will have better claim rates for all of you .