Most offal (especially the bits I have mentioned) is high in protein, minerals and vitamins and low in fat- more so than any of the "main" carcass that is considered to be prime meat . Cooked properly it can all be delicious and nutritious
People have been conditioned into not buying offal, but seem quite happy to nosh into burgers or sausages which sometimes are a combination of the worst and least nutritious types of offal (the intestines, anus and the nose spring to mind
)
The French famously eat every part of a pig except the "oink" and can cook it in the most delicious of ways. Snails and frogs legs can be wonderfully tasty, as can humble seafood such as whelks.
Brown crab can taste way better and is much cheaper than lobster, but so many people are food snobs these days (although that snobbery is more down to preconceived dilettante notions rather than any real understanding of cooking)
The ludicrous "TV chef" cult that determines many of the UK's eating habits these days doesn't really venture beyond a few cheaper cuts of beef or fish any uglier than a cod and I seriously doubt anyone buys their books for recipes (I presume they buy them as gifts for other people?)
There's a world of food out there and eating is one of the greatest pleasures available to mankind - don't knock anything until you've tried it and eat with an open mind. You might be pleasantly surprised what is actually available and how good it can be to eat
The only thing I have always wanted to eat but have never tried is abalone (a big whelk.) I doubt it will taste any better than the whelks and buckies you can buy in the UK for buttons, but if I see it on a menu somewhere I'll give it a go