Some people make up to $2,000.00 per month collecting and hauling scrap metal and others make less.
To make the $2,000.00 per month constantly you're gonna need a constant supply of scrap metal and you'll likely need to post ads on craigslist or live in a large population city or town that has a lot of scrap metal to pickup.
Collecting and selling scrap metal is hard work too.
For the less populated areas you might not get as much scrap and you might go a month or so without any or much scrap at all to sell.
Usually more scrap can be found in spring weather when people are getting rid of things to do spring cleaning.
If you can't get much scrap on a consistent basis then you might be lucky to make $100.00 per month.