Ask HN: Why do you buy and how do you choose cryptocurrencies?

If you buy that is..

I'm wondering if people are still into a higher vision of the technology or just wanting to take part in the ever rising markets to make money?

Also if you buy (regardless of motive) how do you choose what to buy or do you just go for the default Bitcoin? What exact parameters are you looking for? Like Proof-of-Work vs. Proof-of-Stake, limited number of coins vs. inflationary, how important is how the community operates? How developers are paid?