Originally Posted by theloststar

I don't even want them because they're stronger. I just want them for the sake of having them.

I suggest you drop that mindset unless you're a "whale" who has more money than common sense. The only way you're going to 'collect them all' is by spending obscene amounts of money.

With that said, there have been several good chances/promotions to obtain rainbows over the past couple months - so anyone who has been playing for a length of time should have a couple by now.

As for spending money, I'd suggest taking a comparative approach - have you gotten enough enjoyment out of the game, relate to other forms of entertainment that you actually pay for? If so, figure out how much that is worth and wait for a good/guaranteed deal to invest in your future entertainment with. (Don't 'gamble' with your money unless you're prepared to 'throw it away'.)

As for flower gems, Events are a good source of them for fully clearing each mission. I personally find hording affection items and maxing knights out when needed is a good emergency reserve as well. (Having a large stash of affection items is going to be useful when Blooming Forms get added as well.)