It seems like an oversight by the dev team, there is no way Mab added open lock to tailoring with the intention of helping classes that aren’t rogue or beguiler access loot, I think he knows himself that Beguiler, Wizard and Rogue should be uncapped open lock users. Bards and whatnot have no place selling equipment, the economy should be purely ruled by these 3 classes.
I strongly disagree. Now this is less so to do with making certain classes best at lockpicking versus other classes who should come in second. (I agree classes with open lock as a class skill should excel in open lock)
It is more about what the goal should be for who has power in the economy and why. Do we want to give so much power to a certain few and what ramifcations does that have.
What you are suggesting will boil down to solo/ninja looters who hoard all the treasure with monopoly boosted prices. That is what ruling the economy means. The rich get richer.
The goal should be, treasure is awarded to those who gather friends and overcome challenges together.
By being a lockpicker, you offer the highly desirable utility to your group, you will help your group - or friends grow.
If the server caters to ninjalooters, than less of the above will happen. (this is another segway to redesigning content so ninjalooting is deterred)
Lastly,
I am very confused by the statement, Bards have no place selling equipment. Bards who are typically charisma focused, have sociable and persuasive demeanor would do well as a trader. They obviously have existed in the past. (correction, so appraise is INT based, but i have seen many times a bard who skilled up appraise and the trader feats)
Though this really means who are we to say can't be a trader?