Thanks for great explanation. So number of tickets is (of course) also important. Do you have any idea what strategy will you adopt for live server? I'd probably start with easy games till I get more negotiation power from rival quests.
Another question regarding rival GE negotiation quests. Will they mark as complete if my GE finished completely (level 5 included, of course)
I would say that very early in the game you should do a few easy games to allow ticket generation.
Most of the progress is in the later games.
Easy last 2 enemies 10 progress (4+6 on a total of 20=50% of all easy progress))
Medium last 2 enemies 12 progress (5+7 on a total of 25=48%)
Hard last 2 enemies 18 progress (8+10 on a total of 35=51%)
So any ticket that you do not beat the boss is half wasted.
In early game you have much more tickets that coins >> easy game
Note: doing quests produce coins but also 1 ticket every 4th quest vs 300 coins for 3 quest (daily quest give more each).
Since the quests contain 20 tickets+4 initially, generated ticket can be the majority of all ticket with up to 59 ticket (even if you include the one from rival 8=4 in each).
A big part of coins is from the free daily quest (120 per day, and from the daily quest after the rush quest 150 each day + rival). So to get coin you must wait. Also with high negotiation deck are easier to beat and more rewarding (loot + great loot).
Negotiation can go up to 50% including both rival and the grand prizes you can reach for free (there is more in GP but I think you need diamonds to reach those).
An hard deck require about 400 coins I estimate to beat. A medium deck about half that I think.
The easy deck is the only one you can beat for less that 100 coins, even if you but an extra card like great loot (which is very disappointing on easy if you get 3x 2 fp pack!)
My strategy will be:
Play easy deck and do only 3 first quest until first rival. That is 3 battles per day using basically 120 coin max on all three.
Once first rival is on, do more quest and battles depending on rival request (easy unless it specifically as to do medium boss).
Once Rival finish stop at the first next quest that give a ticked and do not collect it.
At the second Rival do more quests and easy deck unless required to do otherwise (it had some hard deck required, so need many coin).
Then play as many hard deck as my coin permit and the rest as easy deck.
But I did not do any analysis on which produce the best return for coin spent.
In any case, ticket you do not have coin for should be used on easy deck.