What? I thought the the debate was on whether or not there are any inherit SEO advantages through the TLD .com VS .net? And my answer is no. Not whether or not I would bother registering other TLD's.
If I really really liked a name but the .com was not available and the .net was, I wouldn't be worrying about any SEO disadvantages. Might you lose a TINY percentage of typein traffic going to the .com? Yeah, but that's not what we're talking about.
A "TINY" bit? Really? I think it's likely that more than 60% of type in traffic will be lost to the .com.
And I still stand by my original statement; take 2 similar sites in the same niche, with similar on page SEO, similar number of pages, similar content and similar number of backlinks and the .com will outrank the .net every time.
Someone who is better at SEO than their competitor could outrank a .com with a .net, but if all things are equal, the .com will win.
I simply think it's just a bad decision to develop a .net into what is supposed to be a mainstream retail site. If I were the OP, I would be clicking on the link that is on the .com GoDaddy parking page to inquire about purchasing the name if he's really liking the singular version.