First of all it's those investments that people are considering risky that end up paying the most. If most people thought that BTC means easy profit without risk they'd all go in, flood the market with money and stabilize it. That's how mature market are acting. Check out oil prices, natural gas, things like that. If you see a move of 10% a year it's a decent run. BTC can move by 300% in a month and it's considered nothing special.
If only more people understood this. The riskier the investment, the higher the reward.
A lot of people shy away from Bitcoin because of it's volatility, but you need to be able to stomach the crazy price swings in order to make the high returns. Unfortunately, a lot of investors like to play things safe, and that's why Bitcoin is still relatively niche. That and the fact that it's a totally new asset class/technology. New tech scares people.
Once an ETF is approved, that will allow for non-crypto savvy people to easily invest in Bitcoin (assuming the minimum buy in isn't astronomical, which it probably will be). I'm waiting for the day when I can diversify a % of my 401k into Bitcoin...