^
This. I completely agree. I was thinking about this just yesterday again, that this has been the case for a while now.
Then again, I do get it. They already introduced the Rainbow Medals, which is an alternate sure way of getting your waifu. It takes a while sure, but it allows you to pick the girl of your choice whenever you feel like it.
As such I can understand that the over abundant amount of gems had to be toned down a litle bit. After all they are selling them in the cash shop.

Plus now you can buy a pretty decent crit girl with 90 gems, which is another easy to get 6*.
Overall I agree, but I can also see the reasoning behind all of that. They need some stead cash inflow, and while I am sure there are plenty of people buying the DMM points deals in the Gacha, I am sure plenty of the whales also buy bags of Flower Gems in between.

It is true that I would love for them to do some more promo log in events, as it seems that while they are still being done, the rate at which they do them has decreased a little.

**tried to pull for BB, of course I got pure, undiluted shit without a single gold (wasnt even aiming at rainbow). Not enough gems for a second pull. Mmm >__< sad mofu.