Sausages have a dubious reputation, and deservedly so in many instances. The secret is, is to 'know thy butcher!' As my old Gran used to say : ''If a butcher eats his own (whatever) it's probably o'k''.
When Gran made sausages they were always of the 'banger' variety, a mixture of pork and beef and/or whatever else was available. It is true that all manner of bits of meat from the walk-in shop freezer was used, but it was all good stuff; it just didn't look so good, is all.
She swore that you could NOT make a good sausage from just meat! She used to add about 15-20% of bread/cereal to the sausage mix. This filler helped to keep the shape of the sausage during cooking and, as the meat contracted during cooking, this filler used to swell and absorb the fats/juices lost from the meat; thus maintaining both shape and moisture. She also added a few tomatoes to add colour and, if the mixture felt as if it needed an extra measure of 'binding' she would add a banana, or an egg, too. She seldom added much in the way of seasoning, beyond what was absolutely necessary, believing that anything that was highly seasoned was an attempt to hide something!
It was 'experience' that told her what to add, to maintain a consistent product, because each batch would have, to some degree, different constituents...the entire point of the 'sausage' is to use-up left-overs and scraps.
And yes, Gran ate her own sausages! Her black-puddings were deeeeeeelicious and her enormous pork-scratchings were to die for (and not 'die of'!).... a poke of her pork-scratchings, just three or four giant 'collops' to the bag, would last me for half a day of earnest chewing. I remember my jaw tiring before I could finish; I'd have to keep the rest for later! But, like the sausages, they were ONLY made when the materials allowed; they were 'scrap' products and not a regular offering.
So, beware of any butcher who advertises solely 'prime beef (whatever) sausages'...as according to gran, he's either a liar, a fool or a bad butcher! Or, I suppose one might add 'he has daft customers with more money than sense, or taste-buds!