Altcoins value depends on several factors. First the success of the projects and their markets. Second the number of investors and the community and their involvement in promoting the respective coins or projects. Third the real world use and intrinsic value of the coins. Finally the most important is the supply and demand of the coins.
Manipulation and speculation are the main reason of price growth. And all your points of interest are as help for this MM. Nothing personal only business
more value is in some coins that provides certain services or goods. In other words, they are the development of companies with a certain direction. Basically, all coins have a price due to demand. That is their value.