Shopkeeper experience is granted by selling items to customers. You gain 0 experience from using the Trade House.
Each item has a flat amount of experience when sold to a customer (the same item sold to a customer will always grant the same experience). The amount of experience is ONLY based on the Base Price of the item (at 0 crafts). Surcharging, suggesting, discounting, impatient customers, or having the price increase upgrade has no impact on the experience gained.
Each quality of item has its own base price, so a Great Base Price will grant more experience than a Common Base Price of the same item. The amount of experience gained with an increased quality is exactly proportional to the base price. 1 Great has the same base price as 2 Commons. Selling 1 Great grants both the same amount of Gold and Experience as selling 2 Commons.
How to Gain Shopkeeper Levels Fast
1.) Get gold.
2.) Increase your Net Worth.
3.) Buy Equipment from the Trade House.
4.) Sell Equipment to Customers.
1 Option A.) Sell items requested on the Trade House that are listed at 9x the base price of the item.
1 Option B.) (Available at Shopkeeper Level 15+ Only) Buy a key with Gems. The higher level the key, the better. Key order in Highest to Lowest: Primal, Dwarf, Magic, Gold, Iron, Leather, Wood. Sell the item for the maximum amount of gold. Your Trade House maximum might be capped by your Net Worth.
1 Option C.) Complete achievements. Many will grant 200000 Gold for 3 Stars, 1000000 Gold for 4 stars, and 25 gems for 5 stars.
1 Option D.) Use the gold from selling Equipment from the Trade House to customers.
2.) How is Networth calculated?
Networth includes the following: Shop Upgrades, Furniture Value (and upgrades), City Investments, Hired Workers Salary (their current value at the level), Heroes Equipped Items (it's technically yours since you lend it to them)
Networth does NOT include the following:
Current gold, Inventory.
3.) You can only see Equipment in the Trade House up to 5 levels higher than your shopkeeper level. If you are level 10, you can see every item in the game from level 1 through 15. As soon as you become level 11, you can see 1 through 16. You can also see any item you have unlocked or that has been added to your inventory.
For recommendations of what items to buy, see the images below.
4.) You can only sell items to your customers that are +7/-7 Item levels versus the Hero level, and only items that they can equip. If your heroes are not high enough level, you can pay directly into their Hero Building to give them experience. Or you can send them on quests.
25 Most Experience per Base Price Gold Items Level 1-10
25 Most Experience per Base Price Gold Items Level 11-15
25 Most Experience per Base Price Gold Items Level 16-20
25 Most Experience per Base Price Gold Items Level 21-25
25 Most Experience per Base Price Gold Items Level 26-30
25 Most Experience per Base Price Gold Items Level 31-35
25 Most Experience per Base Price Gold Items Level 36-40
5.) Repeat until you are level 35. You can now get all the rewards from Raids.