I answer questions as I receive them. Lately, though, the eBay message system doesn't seem to fit through my spam filters.
On the issue of PayPal - I preffer it. It is integrated into the eBay selling panel which lets me see what is waiting for shipping, then generates the shipping label in an easy to use web panel. It is worth the fees vs me driving to the bank, getting line and depositing money orders and checks. The only problem I've been having with PayPal is their e-check system. It lets me know an echeck has been submitted but not when it clears and it doesn't update the ebay item page. I get a lot of paypal payments every day from my website and from ebay so following up on a single echeck it really hard.
I tend not to accept personal checks except from a very few who I have a very long history with. Selling in volume makes managing a lot of personal check difficult. If I sold in smaller quantities I would probably accept them again.
And to the rudeness factor - that sucks. But on the other hand, I think a lot of dealers have been getting hammered lately on all sorts of issues and questions. For example, I have been dealing with a lot of very unpleasant people in Canada - so muxh so that I ask most bidders from Canada to contact me prior to bidding. One Canadian guy actually said "when your dollar falls so low that you can't buy a loaf of bread and you're sitting in the cold because you can't afford heat, then we Canadians will take pity on you and maybe help bail you out." This was due to a shipping quote error on an auction. Another guy called me to pay for an item and asked where we were located and I said Brooklyn, he called me a crook and hung up. Other things have happened too.
Other than that, a potential customer has every right to try to determine the authenticity of an item and as k what they need to ask including a guaranty. I always encourage people to ask questions if they need to.
Whew.