It could be expensive, but not for me. I run a simple 16′ tiller, basic 12v bow mount and a simple 2d helix unit. A couple of combos that maybe cost $250 each, and a handful of inexpensive bucktails, livingston and llungen cranks, and maybe a medussa in the fall. I am happy with the number and size of skis I catch and am not into it for much money at all.
I started off simple. The more I did, the more I bought. At one point I was going out 5-7 days a week and spent more time on the water chasing muskies than at work or home. Made it easy to justify the cost of buying custom rods. Those rods made it easier to be out longer. (less fatigue and soreness) One develops a hell of a collection in their lifetime. My favorite musky rod might be down to costing me $0.05 a cast by now when you divide the number of casts over the cost of the rod.