I noticed that after I purchased a bundle it was still there at the price of $19.99 with more included which is great. However the gems in the $19.99 version are 24,000. If someone pays $100 for jewels they only get 33,000 gems. That's horrible compared to the bundle. I have no experience but I think you should lower the price of that offer or up the amount of gems so that it's worth it. Looking at it from my perspective why pay $100 for only 33,000 gems when I can get 42,000 gems for only $34 using the bundles(buy each one time for 5.99 for 6k each then one at $19.99 for the 24,000 for a total of 42,000)
If I'm not mistaken, most of the gems and other items in the bundle are because of a "First-Time Purchase Bonus". So technically it is fair.