Some people will also sell bitcoin at anytime.
But you are right that those altcoins are shit coin. My personal message is true about altcoins because they are truly shit coins.
XRP all time high was on January 4, 2018 which was $3.84. XRP has not yet gotten to all time high, do not believe all those fake news like when it got to $.3.3 in January that many people are saying it got to all time high, it is a lie.
Bitcoin is a store of value while altcoins are for pump and dump.
They have this one capital from which they can earn and other coins are for live trading and if we look at them then it is not really good for the future and if we look at Etherum or BNB then they are going up at a pretty good pace if we want to trade with them then it can be better. There are many projects on XRP now due to which they do not emphasize it so much which is why its price has also been kept low. I am not saying that this is the only reason why Altcoin did not get support in crypto the real reason is this. In the case of Altcoin any prediction cannot be correct due to which live trading can be done on them which is by looking at the up and down scale.