The Straight Dope mentions (regarding how much beggars earn):
In short, it's pretty hard to get good data on the issue.
Are there any reliable sources that show the actual existence of these professional beggars who earn six figure amounts (when converted to USD) yearly? ["Six-figure" means between $100,000 and $999,999 per year.] Additionally if possible, how prevalent are these professional beggars (as a percentage of total beggars?)