User blog comment:LuluChoy/Usage of jewels for free users/@comment-24863025-20140717012535

Most important of all Jewel building is MS, YGG and level 10 Castle for free user. Workshop will be more of a luxury instead of something that is essential for early level. It is only useful when your building requires not that much resources and have long build time. Do not get 4 or 5 workshop. the 1k jewel will be of better use no matter what.

Card limit/collection page to me is a luxury item. it is not needed if one does not keep SR/UR as collection and it does not helps with playing the game. You just need a minium 20 cards for each attack unit and def unit. Whereas Deck Cost is more important if one have the cards to use to kill AW. It helps in the game as it speeds up your kill rate, meaning more efficient.

Lastly, you forgot about castle upgrade and using jewel to buy resources(think it falls under shoes.sword) and using jewel to expand  kingdom.

Well, these are my views but nonetheless, good post.