This suggestion is actually pretty good! Don't be too afraid of loosing customers that way. Most who are looking for this special kind of solutions are most likeley interested in other products as well. And things like these let your site come across as community friendly, i.e. let visitors bond with your site and less likely to run away when something new comes along. The site is a great idea, but try to get more products on board, i.e. troll robotics sites, offer successful kickstarter campaigns a place to sell their "overproduction" units, etc.