The photo shows a street vendor sitting on steps, selling vegetables. A Twitter user (Abdullah) is asking another user (Saklıbey) why the vendor won't give all the vegetables to the customer. The joke is based on the observation of a common phenomenon of street vendors in Turkey (and other countries). The vendor is being a little greedy or stubborn, refusing to sell all the goods at once, and expecting payment for the entire display of products, not just the portion the customer wants. The humor lies in the seemingly petty reason for refusing the customer's request. The implication is that the customer, who wants all the items at once, is likely a rich person, or the whole operation is an unfair deal. In Turkish, the joke could be understood as a lighthearted commentary on the potential stubbornness or shrewdness of street vendors, and the perceived difference in bargaining power between buyers and vendors. The expression "vermiyor" (he/she won't give) emphasizes the vendor's refusal. The question "Sizce neden?" (In your opinion, why?) is meant to be rhetorical and draw the other person into thinking about the reasons.
"Abi MIT'den ayrılalı kaç yıl oldu, hala adamın tezgahında çalışıyor musun 🤨"
"Sebzeleri satmıyor, 'saklı bey' işte bu yüzden saklı 🤫"
"Belki sebzeler çok pahalı, 20 sa'da MIT'ye çalışınca para biriktiriyor 😎"
"Büyük ihtimalle sebzeler de MIT'nin gizli bir projesi. İdare etsinler 😅"