Because the syntax is:

  <specifiers> <declarator> {, <declarator>, ...} ;

The star is a type-deriving operator that is part of the <declarator>, not part of the <specifiers>!

This declares two pointers to char:

  char *foo, *bar;

This declares foo as a pointer to char, and bar as a char:

  char* foo, bar;

We have created a trompe l'oeil by separating the * from the declarator to which it begins and attaching it to the specifier to which it doesn't.