It's all in personal goals & objectives. Some of us are here mostly on principle, meaning that we mine (and participate in BTC) because we believe in the purpose and future of the system. Some are here for the profit only, and there's nothing wrong with that, either. You can look at my older posts for why I'm here (I've been doing this off and on...now definitely "on"...since it started). I don't mind talking my own strategy. I've used BTC revenue (before the halving) to finance moving from gpu's to an S2, to S3s, to S7s over the past few years. Now it's adding S9s. I've reached ROI on all my gear, but getting an S9 is still not exactly easy for someone in my position. Once I have an S9 online, I'll start "stashing" half the BTC net as pure investment for security, and maybe using the balance to buy gas & groceries (I live on a VA disability allowance & social security).
Since I figure we've got a few years of good mining still ahead at 12.5 reward, "the plan" is still working for me, at least. Dunno if that's helpful.