http://www.semportland.com/domain/why-is-poolcom-featuring-probable-typosquatting-domain-names-in-its-daily-sales-emails/

Todd Mintz raises an excellent question..  Selling TM intent domains has been going on since before Michael Arrington was the CEO at Pool.  I suspect it has less to do with "design" on Pool.com’s part and more to do with the sheer volume of names expiring.  You can only prescreen so far. Still, a rudimentary filter or diclosure relating to trademarks would not be that difficult and would probably help as this industry matures.