Screw your arguments that 'Secret of my excess' had kisses of LOVE, RarityXCelestia shoe is canon. It had significantly more kisses. Ha!
Class! Time for mathematics!
Given room in castle --> A LOT of kisses on hooves
(+ Fabulous dress- Fabulous parties = less fabulous dress)
Give valuable fireruby you've aged for months --> one kiss
Destroy Ponyville in greed rampage but stop --> another kiss
...And with that we can calculate when it's the end of the world!
In S2 e9 'Sweet and Elite' Rarity kisses Celestia a multiple times on her hooves for giving her a room. So much that Celestia feels quite awkward. In 'Secret of my excess' she's less obnoxious thankfully.
Also, dat feel when your MOM is more successfull with your waifu. (Oh Lauren Faust, you so crazy)