Well much the worse then! ( though I read many players saying they got more than one flag per collection after level up!)
Logically, there should be an increase in the flags rate and the brasiers since we are up grading the tent, and it is the only source for these items! All of this Aside , when I started with the tent I used to get 3 to 5 flags / per collection and often a brasier with them, after I got my second prize ( which included 10 flags) this drop rate changed radically!
I am only stating my own experience, and at this rate ( and collecting religiously every 4 hours) no I won't make it to level 7 and I won't be spending gems to buy what's left to level up!
Not worth it for a decoration tent (that will go into storage after the festival) , Glimmergate was clear on this point!