Sure, but that doesn't mean increasing yield is not increasing profit for regular agricultural practice. Fringe agriculture like hydroponics becomes cost effective when having no other means of production rises produce prices just enough.

And central pivot irrigation increases total production, and average yields as well, when the alternative is rainfall.

Many central pivots near me have permanent crops in most of the corners, usually with drip irrigation. Also worthy of notice is not all land lots are neat squares, and some corners end up being quite small.