When looking at model boats, the cost of the kit is just the start. For years, my mental costing has been "£100, then add £100 for every foot or part of foot length". That included using a bit of thinking instead of money. A large, but relatively undemanding Revell Snowberry when the previous run was being well discounted fitted this nicely, as did the Lindberg Trawler. The relatively small kits might well cost more than you think to fit out - if you can't produce your own running gear, the costs might well escalate rapidly, well above a bigger kit that can use regular running gear. Again, as with anything else, higher performance costs more. A fast launch needs more power than something slower, but also needs its weight keeping down while being strong enough to handle the power.
