if you start including altcoins like CLAM in the list of altcoins that forked from bitcoin then the list will grow as big as nearly 700 coins since all of them forked from bitcoin one way or another. and you can even include secondary forks like the fork of forks (eg a fork that was created from LTC) then the number grows even bigger.
the difference between a fork and a crapcoin is this:
crapcoins made by copy/pasting bitcoin code without any innovation restart at block 0. retaining no transactional data.
however a fork retains historic transaction/block data upto a certain date before they go in their separate direction
But what would you classify "forks" like Bitcoin Diamond or Bitcoin Private? Aren't they "crapcoins" as well? Plus what would you consider Bitcoin Cash? Because the Roger Ver definition would be "Bitcoin forked into Bitcoin Core and Bitcoin Cash". If that was true then what of the other forks that retained the transaction history?