£200 to £300 is 2,000 to 3,000 Yuan RMB.
In Beijing, where salaries are amongst the highest in China, I know plenty of professionals, like teachers with masters degrees (from BJ's top tier schools) and three or four years experience working for 4,000-5,000. At my company, which does game development, which is seen as a lucrative career, we pay graduates about 3,000.
I don't know about Yiwu, but at least in Ningbo, which is a bigger and wealthier city nearby, where my previous company has got manufacturing operations, salary for factory workers did not reach 1,500 three years ago when I was last there and could not have doubled in these years. Zhejiang people are the most tight, miserly people in China, if not the world, which is why they can create these decorations so cheaply, and they do not do so by paying their workers well.
You cannot make 5,000 doing factory labour anywhere in China, not in Tianjin, not in Shenzhen and especially not in any city in Zhejiang or Jiangsu. Hell, you probably wouldn't get more than 5,000 managing an entire assembly line in Yiwu.