Privacy is always the key.
When we chat with friends on social media or enter a keyword in search engine, we are unknowingly giving up our personal data and privacy for so-called free services. As someone who contributes the valuable data, we never get a chance to know exactly how much value our data owns, not to mention make any profit out of it.

Yes I think you should. The price is too high right now. But It might be a good timing for these days because the price is lower in the last two days.

I think cashless society is better than our current society for its efficiency is higher.