Yes, the proportionality is one stupid thing about tipping. If I take a super expensive bottle of wine, is the service worth more? Conversely, if I take the cheapest salad, is it worth less?
You mean I shouldn't have tipped the miminum wage South Asian who installed my beach umbrella? They're far from their family doing a job in a very foreign country, sleeping who knows where along with who knows how many colleagues and sending most of their income home.
Why would you think it was a bunch of "finance bros"? You can BS your way to the top in such things as Sales because raw intellect and mental ability is not required. The same can be said for many aspects of finance. But you can't just do HFT or Quant because you want to - you actually need skills. Same way I can't BS my way into designing a rocket - you either can or you can't.
Because I didn't know what they actually did, I assumed it was just another rebranding of the same seemingly-useless stuff that I associated with finance bros.
I mentioned in the very comment that you're replying to that I was wrong.
There's a more charitable reading that you should probably give them given how much time they have spent in the region! It's a list of three distinct places: mainland Greece, the Cyclades, Crete.