Posts should be able to be edited more than once. Price drops should not be considered bumps and a one bump limit is rather ridiculous.
You can edit your posts as often as you like within the six hour limit. The time limit is there because when there was unlimited editing, some posters altered history or deleted posts making some threads incomprehensible.
The rule about bumps and price drops is there because of past abuse. Anyone can ask a moderator for an exception. Calling it ridiculous is inflammatory and borders on breaking the rule about challenging staff decisions in the forum.