It doesn’t hurt to ask….but, there’s a reason my collection of 80+ games isn’t on pinside anymore. Some people make the approach like there’s an obligation to sell or if you have duplicate titles like I do, it’s unethical to keep more than one.
( I honestly got at least 1 message a week and didn’t want to come off as a bad guy when I didn’t respond since that doesn’t reflect who I am)
I’d say as long as you do it respectfully you’ll be fine. Or in most cases such as myself, trades are more tempting.