There are hundreds of people creating new coins. No one gives a shit about them. Why start from scratch and why should you trust it? In case you hadn't read anywhere else in the forum lately, attempting to change bitcoin itself seems to upset a lot of people.
This is not the reason for which people ignore them. Most of these coins are either designed very poorly, offer nothing new, used to pump & dump, used to promote malware (i.e. they're trash-coins). Barely any of them have any features that would be worth looking into and possibly implementing into Bitcoin. You don't need to trust anyone if you can analyze the code; Bitcoin is trust-less and so is any fork of it that does not have malicious/weak code.