Because I'm not a bleeding edge early adopter, personally. Plus while I never invest funds I can't afford to lose. I still worked hard for it and want to mitigate the risk of loss as much as reasonably possible. To me, that means going with the more well-known stuff. Lastly, I work full-time. Yes, I can check the markets periodically throughout the day and do a trade here and there if need be, but I can't live and breathe this stuff every waking minute to bail if something goes south in an instant with some fresh off the ICO bandwagon altcoin.

I tend to sell when I feel a peak, then re-buy when it's low and I feel it's starting to go back up. With BTC, that's about once a week for each buy and sell right now. I'm not a multi-trade day trader by any means.