Here's some blunt calculations that put the brandable domain marketplace in perspective a little.
The (very) approximate chance of selling a single domain in any given month is 1 in 500, based on 2.4% annual conversion.
For a small seller with 10 domains that makes your chance of a sale in any month 10 in 500 or 1 in 50. This equates to selling 1 domain every 50 months.
Assuming you hand register the domains, your minimum dollar expenditure at start point is $80 for 10 domains, and $100 for BB listing fees. Add renewal fees for each of the 4 years after that and you've got another $320 in costs.
So you need to spend $500 and wait 50 months to make a potential sale of perhaps only $1000 after BB fees and logos. And that doesn't even consider the fees spent on acquiring domains or BB-rejected domains.
Not quite the lucrative ROI that it appears on the surface.