Well, mining equipment is really expensive but with mining you are receiving Bitcoins with paying for them much lower price (electricity etc) after payback so it is your choice
Too bad that Ethereum, really good coin with great team and massive community is used mainly for creating other cryptocurrencies, taking cape about cryptopets but not for something really useful
Bitcoin already recovered once from the 2-years dip, so this dip doesn`t seem unusual or dangerous for me. Maybe only in summer but bitcoin will recover
You are absolutely right. We can see a bubble now but it is based on strong working technology which is going to replace. Strongest projects will become new leaders at global arena.
I can understand you. At this moment cryptocurrencies are not enough integrated in real life. Bitcoin is more like an asset, altcoins mostly are just tokens based on ideas and weak realisation.
ERC-20 is technical standart that has nothing to do with the safety of yours investitions. An official company can give you all guarantees while using ERC-20 tokens.