Yeah, but you live in tropical land where you don't even have heat your tanks, right? And aren't these fish farmed in your country? The cost of breeding and keeping tropical fish in much of the world is higher due to heating costs and shipping fees.
Species native to my area are also dirt cheap, but nobody likes them for some reason.
RTC can cost from 40 to 60 dollars here, which seems really steep for a fish that can easily eat its own weight every day and is soon unwanted.
Yes, I think most people have thought about the process of stealing a fish. I mean, to catch a criminal you have to know how to think like criminal. Pretending you lack the intellect needed to pull off a petty crime isn't impressing anyone. Doing the mental math and considering potential plans for theft only makes you more prepared to defend your property, it doesn't make you a criminal. Adhering to moral standards and recommending strong consequences is a great angle, though, and I hope justice is served.