Regarding HiO challenges there is one thing which could make them at least remotely attractive for rational players:
- Obviously, it is a lottery, even if skill-based, as the chance to win is small and the prize is huge;
- Unlike WGT HiO challenges, most lotteries pay out a substantial fraction of the received money (like 80%), not just a tiny bit of them;
- What could be done is that the prize proportions (for within 5ft, 1ft, HiO) would be set as now, but the actual prizes would depend on how much money people actually spent on these challenges during the recent days/weeks/months.
I suspect something like that is already implemented, as longer/harder holes give larger prizes than shorter/easier ones, but it rather seems that the payout is closer to 10 or 20% of received credits, not 80%. And what I suggest is not charity. It's actually good business. Of course, WGT would get only 20% of paid credits or so, but I bet the "sales" would increase more than 5 times :-)