1. "Oh, it's already too expensive, I cannot afford to buy it.
There are so many ways/activity to how to get bitcoin, some works and jobs are available to get bitcoin, Expensive? yes its getting more expensive every month. so why would you not invest any amount that you can afford to have.
2. "The governments don't regulate it, why should I invest in it?"
some of the governments are not yet regulate it because they just want to observe on how bitcoin totally works and how they got income too, but most of the country are wants to get involve in bitcoin for so many reasons, like they want to be part of it because they want got some profits from it and from those who willing to support bitcoin on their country, like here are my country, bitcoin is totally accepted on some online shops purposes, easy to use wherever you are, easy to make some transactions like mode of payment, so its soon to implement this bitcoin in your country too if doenst have yet.
3. "It's an illegal currency and only cyber criminals use it."
we didnt hide that facts that bitcoin can be use of those bad people for their bad activity, but not all people do that. and bitcoin is not a illegal currency. that word "illegal" are come from those fakes news which wanted this bitcoin to be illegal but its not.
4. "What backs up Bitcoin? For example US Dollar is backed by Trust (all time favorite response Cheesy), but what backs up Bitcoin?"
bitcoin is more backs up than US DOLLAR you mentioning, and now bitcoin is become all time favorite response Chessy, because of us who supporting bitcoin.
5. "The market is way too volatile to invest."
because bitcoin become more famous and the price of bitcoin became more valuable than any currency already existed.
6. "You can't really use Bitcoin as a currency."
yes you can, you can use bitcoin as a currency. more and more business man now are implementing bitcoin on their mode of payment so why you have many doubts on bitcoin to use as a currency? bitcoin is the future digital currency.