The microtransactions have been the most successful monetization model for games over the last decade.
So i would suggest to actually add more MICROtransactions into the game , we are talking value packs that cost 10,15,20 dollars instead of 100 $. those are MEGAtransactions that only appeal to very small player base, you could still add those for high spenders,but you would only benefit from adding smaller packs that cost less that the majority of your player base could afford and net you more income. And please if you do this add something that makes sense like 15 $ for 10 dice don't throw in random scrolls there for extra "value".
cheers.