At those prices i wouldn`t think you could fail to pick up work,i would think that you have undercut other WC`s without knowing and cost them a fair bit of work.The only thing i can think of for that kind of price most would do would be a small shop once a week,did they say they had a cleaner before you priced the work or did they say i need a WC give me a price,i`d be interested to see which.