Good domain name or not, unless you're an aggressive SEO, if you depend at all on type-in traffic you'll lose a bunch of it because people automatically type in the .com especially in certain demographics.
The fact you are asking the question shows your mind is questioning the validity of doing commerce in a non commerce or at least a possibly perceived commerce free environment.
Your customers will all have different mainly preconceived ideas of what .org means to them.
Some wont care
Some will notice and still not care
Some will be wary of buying thinking it might be a scam
Some will think its wrong benefiting from a non profit.
All can be overcome but you may have to work harder :)
well from the horse's mouth: [icann.org...]
"In the 1980s, seven gTLDs (.com, .edu, .gov, .int, .mil, .net, and .org) were created. Domain names may be registered in three of these (.com, .net, and .org) without restriction"
[my emphasis]
All the non profit companies have monster payrolls to keep them from showing a profit why I try to give to a cause that the money will go to and not to someones bank account....
Org's work great with several important categories of names and not just non-profits (as some still incorrectly believe is the case). They are good with a number of financial website uses, traders, investors, govt services, travel, political, people names, educational and information sites because .org denotes a nice feeling of trust.
Personally, I love org's and have lots of them. Some also get natural type-in traffic but typically much less type-ins than dot-com receives. I believe visitors also have more confidence in an org website so maybe they feel more comfortable ordering from it too. What a great benefit that can be!
Some American not for profits tried to retrospectivly grab all .org for themselves when the .org registry was last up for renewal - this got kocked down.
I worked for one of the bidders for .org at the time
put more emphasis on the DOT_ORG TLD by using a larger font or different color on your logo and most of your visitors will remember it!
it's worked for me!
good luck