Pooley and Lomax - Real Cidermaking on a Small Scale:
(clearly the authors are avid cider makers...)
page 6: 'The likelihood, however, of our sown pip ever yeilding a variety of any worth* is extremely small'
' ...add a small ration of crab apples to the mix...'
clearly the first reference above refers to commercial worth, because tannin-rich apples from the hedgerow (or wherever those wildling pips find growing conditions...) are most 'worthy' indeed to the home producer!
Many of the 'crab' apples I use are most certainly from discarded apple cores, some of them certainly worthy enough for grafting for cider apples with a good balance of sugar, acid and tannin - get sowing!
(*italics are mine)