Probably cos Kate doesn't do OK! Mag interviews about the size of their respective cocks afterwards for her kids to read.
KP's men choices are pretty grim, overall. That's the only quibble I have with it, that they all seem to have disaster written all over them and the initial 'happiness' will be replaced in no time with the same old same old. Why can't she just get to know someone properly and if it's still working after a year or so, then think about making it a permanent thing, not after 5 bleedin' minutes.
Presumably a year of "getting to know someone properly" doesn't shift as many magazines as this week's engagement photos.