To add my first entirely non-glib contribution to this thread, what Savy is saying does somewhat tie in with something I've been thinking about recently, which is that I don't just want to spend my time improving how well I exploit fish (although that is important for profitability, building a BR and moving up) but I also want to put more effort into improving how I play against "competent" (for my stakes) regs, since that is what will most quickly improve my overall play and allow me to hack it at higher limits as I move up.