[h.sie]

@Stiebler: According to your initial idea, I divided the amount of total tonnage sunk into several "tonnage groups":

0 - 10000 t : group 1
10000 - 20000 t : group 2
20000 - 40000 t : group 3 and so on.

I assigned every group a certain chance for a motivation message, which gets lower for higher groups:

50% for group 1,
25% for group 2,
12,5% for group 3
6,25% for group 4 and so on

Would you suggest to completely disable these motivation messages for other groups than group 1 (0 - 10000 t) ??