There are aspects that make bitcoin users more and more convinced that bitcoin is a good place for investment so now bitcoin prices are rising in the market!
Bitcoin's price is going strong, but not as strong as the alts in the market. Altcoins' price are shooting through the roof. It doesn't matter which alt you pick. Most of them have given phenomenal gains in the last 2 months.
Alt are giving higher returns because of low market cap. With a slight increase in demand it gains value and depreciate when demands go low. Small changes show major changes in alt. Bitcoin on other hand has huge market cap of about $9 billion. Thats why it dont show huge change but a steady and a gradual change.
Yes, that's the point. None of the altcoins can match the huge market cap that bitcoin has, and that's the reason it has sustained so far with more or less steady prices(comparatively). Also, bitcoin has been around for far more than the alts, most of the alts stay in the spotlight for few months maybe a year and then they are nowhere to be seen, while bitcoin is still in the spotlight for around 8 years.