Is there any way to make a profit in Sushi High Roller?

Question

Or is it just a money sink?

Answer 1

No,

There is no way possible to come out of Sushi High Roller with a
profit. Even with Max Style + Amulet Coin + Lvl 3 Prize Money O-Power
the numbers run like this:

Entry Fee (With Max Style) = $450,000

What you get:

Prize Money (With lvl-3 O-Power & Amulet Coin) = $160,000

Big Nuggets * 25(Best possible) = $250,000

Total winnings ~ $410,000

That is still a net loss of -$40,000. So Basically it is not worth
going in there for money, unless you want a completionist record for
starring all the battles, or the Exp.

There is no confirmation of the Entry Fee going any lower, for it to
become profitable.

All of which came from here. However, as noted in the source, the event move "Happy Hour" also doubles profit. So, this may be the only way to get a profit out of the Sushi High Roller, but, to be honest, if you're going to all that trouble, you may as well use Restaurant Le Wow as a money/training source. If it's purely for money, I recommend using the Battle Chateau instead.

Answer 2

Well, let's see. It costs 500,000 dollars to get into Sushi High Roller (450,000 after your first try). Let's go through all of the battles and see how much you can make with Amulet Coin and Level 3 Prize Money O-Power.

Amulet Coin doubles prize money gained, and a Level 3 Prize Money O-Power triples it. This is x6 the normal amount of money gained.
Battle 1: $28,080 reward - $421,920 down
Battle 2: $28,080 reward - $393,840 down
Battle 3: $28,080 reward - $365,760 down
Battle 4: $28,080 reward - $337,680 down
Battle 5: $62,400 reward - $275,280 down
Perfect Reward (25 Big Nuggets): $250,000 profit - $25,280 down

Now, here are all of the same calculations but with Happy Hour Inkay in play as well, boosting the prize money gained to x12. (Exclusive to Japan without trading)
Battle 1: $56,160 reward - $393,840 down
Battle 2: $56,160 reward - $337,680 down
Battle 3: $56,160 reward - $281,520 down
Battle 4: $56,160 reward - $225,360 down
Battle 5: $124,800 reward - $169,200 down
Perfect Reward (25 Big Nuggets): $250,000 profit - $80,800 gained

So, yes, it is a money sink only if you don't have Happy Hour in play. However, you can get some good experience out of it as all of the Pokemon's levels are 65.

Source

Comments

What about the highest Prize Money O-Power + Amulet Coin or Luck Incense? Also, the meal price drops to 450,000 after your first try.

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Let me calculate that.

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Sorry, was typing my answer so I didn't see yours :(

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No problem :P
I'll hit 3k somehow