Most of the BODs do offer various crafting Power Scrolls as rewards.
A player just concentrating on doing BODs, will eventually get the scrolls to become 120 in all crafting types.
Clothing can increase this skill further. There is also some armor that can increase Fletching, Blacksmithing, and Tinker as well.
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Add a Talisman with the relevant crafting skill that can increase chance of success between 10% and 30% chance to craft an item for either normal, exceptional, or both.
For a serious BOD runner multiple characters and a Second account with max number of characters will produce and very large amount of BODs per day. Just remember to have each alt at different levels of crafting instead of all at Max, as the types of BODs received with vary depending on skill level.
If you are interested in seeing which BODs currently offer which rewards feel free to check out a project that has been coordinated by Shena, BobThe Builder, Susro (me), and a few others. The link for it is:
https://docs.google.com/spreadsheets/d/1JxxTuHjsPQW0wEE6NBXk5fni5c-Q9Y72EEIvlo29xjc/edit#gid=0
They have put a lot of work into it, for anyone that is interested to check out, also the Devs have access to it so they can see what is actually being rewarded and to change it in the future if Kane has time.