A PAID reference: event packages sold during ~11-day events in five price tiers -- $4.99 (1st), $9.99 (2nd), $19.99 (3rd), $49.99 (4th), $99.99 (5th). You can pick any tier directly now. Purchase limit: one/day per tier, EXCEPT the $99.99 pack up to 12/day. The $4.99 pack is widely considered the best value. Contents scale with tier; $4.99->$99.99 includes VIP Points (1,000->25,000), Gems (30,000->250,000), Gold (5M->55M), Speed Up (256h->5,820h), an Optional Chest (Lv1->Lv5), Blood of Ares (4->60), Covenant Stone (1->20), Subordinate City Clue Chest (20->250), Premium Gear Chest, Merit Jade, Glory Golden Twig, Forge Master Certificate, Source of Life (72->700), Adv Troop March Speedup, Dragon Gemstone, and Monarch/General EXP (50,000->1,500,000). The $99.99 tier exclusively adds an Epic Historic General (Glory), Hephaestus Hammer x5, Senior March Size Increase, Lv6 Barbarian King's Token. The Optional Chest lets you choose items by group (A resources up to 2.8B each at Lv5; F research stone/tactic scroll/research speedup; G dragon & Achaemenidae scroll chests only at Lv5; H badge/dragon crystal only at Lv5). Paying also grants a free Limited Time Promotion package sized to Basic Gems purchased. For a bot's spend logic, the $4.99 first pack is the value pick; a mostly-F2P bot skips these but should understand the Optional Chest for players who do buy.
Original research source: Evony Guide Wiki