Sunset cruise: The shared sunset cruise is the cleanest line on the menu. EUR 34 covers the cruise, guide, drinks, and snacks. The optional wine upgrade is EUR 40 instead of EUR 34. Nothing is added at the pier.
Dinner cruise: The drinks tier matters most — Silver (soft drinks) EUR 30, Silver Alcoholic EUR 45, Gold Unlimited EUR 80-90, Platinum / Diamond on request. VIP seating is a separate upgrade. Hotel pickup is bundled into Gold tier and above, but priced separately on Silver. Many aggregators list "from EUR 30" without clarifying that Silver is soft-drinks only.
Private yacht: Watch for fuel surcharge (EUR 30-80 per hour on some operators), docking fees at Kuruçeşme (EUR 15-30), catering add-ons, and a 10% discount that applies automatically from 3 hours onward at GoldenSunsetTour. Always ask whether the headline rate is "all-in" or "fuel and dock excluded".
Aggregators: GetYourGuide and Viator layer a 25-30% margin on top of the operator-direct rate. The platform price is what you pay; the operator receives EUR 25-26 from a EUR 35 sunset ticket, which is why same-day platform-mediated changes are slower. Direct booking removes the margin and keeps the support line short.
Walk-up boats at Eminönü: The headline cash price is the lowest in Istanbul, but the trade-off is no TURSAB licence, no insurance documentation, no refund policy, and no contract trail. Acceptable for a 15-minute strait crossing in calm weather; not recommended for an evening cruise.