At store.lotro.com there is a single-use version of the All Quest Packs Bundle available; this will automatically be applied to the account logged in during the purchase and is priced at 79,99$.
AFAIK, the quad-pack does not include any non-expansion quests/areas and no skirmishes or instances other than those included in the expansions. The two offers should not share any content between them.
Whether the pricing of the All Quest Packs Bundle at store.lotro.com is optimal to maximize the nuber of units solds can be argued about, but if somebody only wants to purchase a single copy of that package, buying the single-use item is certainly a better deal than buying four copies of the same.
German, female, migrated from CodeMasters in 2011, Premium member, slow-leveller, pure PvEer and opposed to Forced Emotes - wherever I fit into the statistic, it's not in its middle.