That's not really how we should attract people.
Instead of telling them 'hey, invest in BTC you will make money!' what about to tell them 'hey, see how BTC is useful'. It's better to see them coming as 'real users' and not as speculators.
That's how I think mass adoption should come from. (without denying that there will always be speculators)
Investing in bitcoin is a valid use, one of many in my book. Investing and speculation are two different things too.
Just to be clear, putting money in gold or bitcoin to preserve one's assets from the ravages of central bank induced fiat inflation is a great use for bitcoin. That is a "real use" of bitcoin and a critical one. Look at the threads from Cyprus 6 years ago, Venezuela etc. Any place in the world that uses fiat should have people investing in bitcoin to protect themselves.