I buy guns that I like and want to keep and shoot.
If I am not impressed,or just doesn't fit my tastes, I sell it at the next gun show.
Example:

The last show, a fellow came to the table with a Walther PPQA 9mm, in its factory case,with all papers,all accessories, with 3 extra Walther magazines. 4 mags total.
He had bought it several years earlier and now needed money as his wife was expecting their 3rd child.
I and my gun guru associate looked it carefully and I bought it for 400 Dollars.
I now have read up on it and now know what the QA model is and it's main distinctive trigger feature.
It fits my hand perfectly, and I like the ambidextrous magazine release.
I'm now ready to go to the range and fire some rounds thru it.
If I somehow do not like it, I will take it to my local gun store and have it's gunsmith install a 5.5# Glock trigger spring in it.
If I still am not happy, I will simply re-sell it to another qualified buyer at the next Texas Gun Show that I attend. God Bless Texas.