Daily Deal word/reward consistency

Suggestion- no 3-letter words on Gold Fever Sundays

Have GENIUS in Paris for the gold fever.
Still playing it and already got 3 letters without using boosters and 3x(60) coins more.
ETA : got it

I have JET in Marrakesh. It was an easy city and I already have one letter so may carry on.

I usually don't bother with the daily challenge for only 2 boosts and usually something I would never buy. I did one this week in Bangkok, where I have just started, Not too many letters and easy levels so I won that.

Today FERRY in Cairo so earned 210 coins and 2 winds of change needed no boosts and lost 2 lives so I guess it was worth it.

Gold rush BERET in Amsterdam with 1 mb and 4 arch levels so earned 180 plus 250 for the cost of 3 shovels.

Gold fever in Tokyo today . TAXI so earn 200 without boosters

MIME Today in Cairo for 200, loss of one shovel and three lives...

HOW ARE DAILY EVENT LEVELS SELECTED?

According to my previous experience, up until now all Daily Event levels seemed to be randomly chosen, but always among levels where I hadn't completed Architect and/or Master tiers. Recently though, there were 3 times where all tiers were already completed, even though I still had plenty of uncompleted ones in the same city, and this was always in Sydney. The same thing happened to both my games so it can't be a coincidence. Has anyone noticed something similar?

Eli, seems pretty random to me, I don't bother doing it if it is in Sydney or Tokyo where I have completed all levels and I often don't do it if it has levels I have already done - I like the coins that come with the boosts. Today was a beauty for me, TERRACE in Moscow, all architect levels I hadn't done so 350 coins plus the 210 for the levels and no extra moves and just one shovel which I had spare.

Trav you are lucky today!I have POND in Paris and have difficulties to get one of the letters.
Hope I'll have more luck next Sunday

Today SUNSET in Amsterdam, 5 architect and one master level none of which I had done and the reward was 2 ice block blowers. Which I have never used but I see they are expensive and should come in very handy

CREPE in Hong Kong, all architect levels so 150 coins and 2 of those very handy palm trees!

KIMONO in Amsterdam a lot of work for only 2 shovels!

CIRCUS in Mexico, 4 architect, 2 masters used no boosts or extra moves so scored 240 coins and 2 palm trees - very nice!

If anybody's interested, good info in Eli's post, and those of others regarding daily events one page 1.

Fish

Gold rush today ROYAL in Istanbul earned 240 plus the 250 for the cost of 150 for extra moves and 1 shovel which I already had