Yes there absolutely is! All this has been suggested for literally years and no notice has been taken by BB. As a rule BB changes stuff rarely and then leaves it for years without any change whatever the feedback. So if something is changing it is the only time to have a chance of feedback being noticed.
(I should go and edit my post in another thread about how BB is making this game single player adding "Belonging in a guild is now pointless: there are no items worthy of repeat purchasing in guild market.")
About the changing vote for gems: seems like every new feature having a gem component is a requirement for starting development. Changing vote for gems is a luxury: you dont need it to make use of the feature. This is a good choice by BB to put the gem component there.
About guild market rewards being available to only people in guilds: move the guild market from merchant to the new guild voting page.
BB has said it themselves that its easier for them to conduct voting ingame. Now they have interface with buttons icons and prices in guild page. How hard could it be to add the function to click, confirm, subtract cost and add item? All in one place.