It might not be easy to convince people to believe about bitcoin especially that a lot of online scams are constantly evolving. Showing them your actual earnings might help. I guess.
Yes it can help, its convincing to people if we can show some proof that we are earning through it and in that way it would be easy to convince them to try using bitcoin.
However because it can only be use online they think its scam and we cant blame some people for believing it because of the news spreading negative feedback when it comes to online matter.
Thats how it is, we cant please everybody and we should respect what they believe into.