Ok a little math....
I'm using a 30 second battle time, but that's really being generous.
Let's say it takes me an average of 10 fights to get one petal.
10 fights x 5 petals = 1 rose
50 fights x 300 roses = 1 item
15000 fights = 1 300 rose item
15000 fights x 30 seconds per team battle = 450,000 seconds
450,000sec /60sec = 7500 minutes
7500minutes / 60minutes = 125 hours
125 hours/ 24hours = 5.2 days.
Someone said that the event runs for 6 days?
That means to get the middle of the line item, the player can have less than an hour of sleep each night, and can have no other obligations or need to eat.
If the average battle takes even slightly more than a reasonable 1 minute 30 seconds then it becomes physically impossible to get even the smallest prize let alone the 800 rose prize.
Please tell me my math is wrong. I'm begging you. Edit: I see that we actually get a tiny bit more time, but that only means people will get a little more sleep. Not enough extra time to avoid the problem.
This is assuming the lvl 30 version of the boss. I haven't timed the actual battle length, but having to account for wait time between battles makes it kind of unnecessary.
In addition to that, these are set items which means, assuming anyone can even get one, the only way to complete the set is to buy another piece from another person at an impossibly high price.