XRP have big and solid community and they maintain XRP price stable. Maybe its because XRP daily transaction volume very big and its true that XRP is good coin and having potential to be biggest market cap value after replace ethereum place as second biggest market cap coin
That is really true that there are some altcoins that are also rising to the top like this XRP, but when stability are been ask for coins ,bitcoin are still the stable coin at this moment , so we just still support altcoins and bitcoin and the entire cryptocurrency.
That is just normal, Bitcoin is not the only cryptocurrency rising in the market.
There are a lot of investors in the entire world and it is obvious that they will not only invest on Bitcoin, they will also invest and find other cryptos they think have a high chance of giving them a profit. In the past Ethereum is making a lot of progress but then it also fell down in the first months of 2018, that just proves that Bitcoin is not the only one.