I am happy with my suppliers but the idea in general must be worth looking at for you.
I dont see a problem with your 3% and £36,000 a year - thats your business.
I get made redundant from my main job on New years day morning, the new job i take on is hourly rate plus commission on top and i wouldnt do it for less than 10% - (Maybe im just greedy though)
All the best with whatever you do