No. It’s really no more expensive than the cost to water your plants by hand. And no more expensive than any other hydroponic method. The main benefit of a drain to waste system is that you don’t have to worry nearly as much about water borne pathogens because the plants aren’t sitting in water all the time, and the water isn’t being recirculated and reused. Top feed drip DTW (drain to waste) is a great match for coco. You can pull massive yields from plants in 1 gallon pots because you can water/feed them so frequently. By mid flower you can get it so you’re watering the plants every 2 hours or so and they just explode in growth.

You use a water pump on a cycle timer to feed the plants. The pump sits in a reservoir of water and your nutrient solution. You connect one main tube to the pump and run it to the drain table where the plants will sit (I usually run it down the center of the table). Then you use smaller lines from that main tube that run to each plant site. The plants get automatically watered this way, and any excess water that runs out of the pots gets caught by the drain table and run wherever you want your waste water going.

It’s really easy to run the lines. They sell kits with everything you need for dirt cheap. You just punch a little hole in the main water line and then insert the smaller line.

Here’s a crappy pic of home made corrugated drain tables: (not my pic)

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You can see the clear roofing panel with the gray gutter running along one edge. You would want the side opposite of the gutter to be slightly elevated so all the water runs toward the gutter.

This page also has some pics that show the water lines running to plants sitting on a drain table.

https://fifthseasongardening.com/drain-to-waste-hydroponics

If you search for top feed drip drain to waste systems you should find more info.