There are 33% chance one of the 6 cards in a R-Gacha is a SR.
There are 17 different SR-gilrs in R-Gacha so on average players need 17 card reveal and 51 R-Gacha to get new SR card.
Unlucky pleyer need to spend more ofcause.

Active players get lots of R-Gacha and Card reveals. It should not be a big problem to get the new cards without spending money.

Card revveal and R-Gacha are very overpriced in shop. If you want to spend money buy E-Gacha for 1$ each nothing else is worth buying imo.

The new card are much easyer to get for free players to get than RS-slayers.

Players who have all girls must have spend a lot more than 1000$ so I have have give up getting all girls.
Still free players like myself can collect lots of girls and have lots of fun. It is not the end of the world if I miss a girl.