I'm still mystified...

Nobody is getting mad, at least I think not.

What I am trying to get across and it appears to be shared by some is that just saying in your ad that you want the buyer to pick up YOUR paypal fee tab is offputting.

In todays hard fought market place why on earth would you do ANYTHING to potentially reduce your chance of making a sale.

As I have said, its all just psychology......

Sellers like to have the asking price as low as they can to attract buyer attention and further down the ad add the additional fees that are part of the transaction. This is not unusual because there are few things that you can buy without paying some kind of additional fee.

The only place I have seen this kind of "standard" seller behavior is with complicated stuff such as selling cars, or selling a large installation/implementation service, or even selling real estate, real estate loans, etc.  I have NEVER seen this kind of "hidden fee" or "extra fee" behavior in the industry with audio electronic equipment.

Saying "sales tax" is part of this thing is not a good example because you have sales tax with any item purchase you make locally in your own state.

I do think people forget that when they buy a product at MSRP, shipping and transaction fees are included in that price.

That's right. It shouldn't be any different when we are selling. It's a business transaction and the seller should factor PayPal fees into his/her price.
Seeing that "add 3% for PayPal" really irks me.
   But, many times the seller has lowered his price slightly when I've asked. They know the 3% is out of line.

This is what I do. If I find an item that I want, priced right but wants 3% PP fees, I ask what the shipping cost is, then total it up, deduct 3% to 5% and make them the offer. It works just about always.