Same as if you are selling your house. You have a listed price. Are you going to sell to the guy that made a full price offer or one that comes in with a higher than full price offer. As long as you have not signed anything you can and most likely will take the higher offer.
If you are using MS Edge for a browser, that is problem no. 1.
Download Chrome or Firefox for a browser. Can get popup blocker extension for Chrome.
McAfee sucks.
There are free antivirus programs that are as good or better.
Some people are just not courteous enough to respond unless something is to their liking.
If someone does not respond in a reasonable time, just move on and forget it and remember the ones who do.
First of all, welcome to the mess.
Remember this ain't Craigslist.
I have never had a bad experience with anyone on this forum.
Remember also, you can test drive a used car and drive fine, then on the way home the transmission may fall out. Most used cars don't have a warranty either.