I support using a merchant credit card facility. If you've already got one, you're already paying for it... so it makes sense to use it. Depending on what sort of plan you have with your bank and the gateway provider, it can be cheaper than using PayPal - but you should check your figures to make certain of it.
One very strong reason for using that rather than offering PayPal is that if a dispute arises, you can be sure of having it investigated PROPERLY. You will not be held to ransom by PayPal arbitrarily holding your funds. If you're a good seller with a good ethic towards your customers, PayPal's protection for buyers becomes irrelevant, anyway (unless the buyer is "trying it on" - definitely easier to do with a seller using PayPal than with a seller using merchant facilities).
However, there IS a perception among
some buyers that they "must use PayPal". It's like the mines left behind after the war is over... It may make no sense to someone who is not a PayPal fan, and who is aware that using a credit card offers better protection than using PayPal, but there may be some buyers who only want to use PayPal.
It may be worth trying out offering payment by credit card (and not offering PayPal), but keep an eye on whether this affects your sales or not. Only then can you really see to what degree (if any) no PayPal on your listings affects your sales.
As to waiting for a reply from PayPal by email... you could wait forever. I suggest you call the PayPal number, keep very calm, have all the information to hand, ask to speak to a supervisor if the situation is not resolved immediately, hold on, keep very calm, insist nicely and politely and definitely that you wish to speak to a supervisor, explain it all over again, state that unless the situation is resolved immediately you will be lodging a complaint with the Financial & Banking Ombudsman (
http://fos.org.au/centric/home_page/resolving_disputes/how_to_lodge_a_dispute.jsp), stay polite and friendly and definite, and if your call drops, call again immediately.