2 years ago I first used a coupon from Google to advertise on a new account.
Then the coupon was, indeed, not so easy to get and everything was within the normal range.
Now coupons are distributed everywhere! Left and right. I just received a letter (I note that I did not even use RBK Money, I just registered!):

What does this lead to?
Yes, the fact that the
cost of a click increases . Growing rapidly.
Don't buy into this trick.
First, you will have to pay 400 rubles for account activation.
Secondly, when advertising one URL from two different “coupon” accounts you will be blocked.
Third, for 400 rubles in Yandex.Direct, the result will be much better, since the cost of a click in similar topics is 10 times less! Why? So because Yandex is great, they do
not depreciate the domestic currency with easily accessible coupons .
Facebook is also following in the footsteps of Google. There's also no problem getting a $ 50 coupon.
Himself advertised. Return was several times lower than VKontakte.
Look what coupons with ad networks are doing, good people!