Very true. I have a Curren that I just got as xmas present. After a few hours of use, I notice I lost a decoration screw from above the hourglass (leaving a very visible hole behind that will certainly collect dust) and some tiny bents and scratches on the metal-looking circle around the hourglass...eBay brands like Curren, KaKa, Chenxi, etc are really cheap. There is nothing wrong with them - I have a Kaka and 2 Chenxi's but they are cheap and poorly plated base metal. After a while sweat and water wears the plating off and soon the watch looks bad. And the bands and bracelets are cheap, uncomfortable and prone to damage.
If you like the style, buy it. Just realize your not getting a watch that is built to last. I bought mine because they are cheap 'homages' to styles of watches I was currently thinking about. Buying and wearing them helped me make a decision on whether or not to buy them.