Why are you limiting this to street traders? Some non-trendy traditional shops are suffering to stay afloat too.How much are we talking for the street traders? Even village business owners I know who are against it said it was a pretty inconsequential amount. I don't like BID but it surprises me to hear that the cost itself is enough to cripple a viable business.
But you'll have to take it from me (or at least until we get another BID feature on B Buzz together, if they're prepared to go on record) that some businesses are finding it very hard to pay out this kind of money. And we're talking four figure sums for something that appears to offer them nothing in return.