The vendor can usually see a little farther than just one point on the price elasticity curve by employing price discrimination schemes, such as coupons, sale prices, and volume discounts. Extrapolation from there is iffy, but interpolation is usable.
Checking whether you could make more by raising prices is a bit more difficult. No one is likely to use a coupon that entitles them to pay 10% more for your product. What you could do is start your day with an auction, where larger buyers can bid on your supply, and then you sell off the remainder (if any) afterward. If your unit price should be higher, someone comes along, buys up your entire stock at the auction, and sells it off at a profit after you are sold out.
In terms of honey, you basically pay honey scalpers to reset consumer price expectations for you, then when you raise prices on direct sales, you become the heroic middleman-eliminator, instead of the villainous price-gouger.