Currency conversion should be done at whatever the exchange rate is.
You obviously have no clue about foreign exchange markets and how they work. PayPal's 2.5% (or 2.6 if that's the case) margin is very similar to almost any other service available especially in light of the small amounts it applies to.
The new reduced rates for higher value exchanges are in fact pretty amazing, substantially lower than other available services. Once again nobody is forcing you to use PayPal to effect the exchange, if you wish to use a third party nobody is stopping you.
No doubt that the per transaction fee should have been reduced long ago, that being said PayPal could have probably gotten away without reducing it if they had wanted to.
We've already paid them once for their service.
You paid for credit card processing, foreign exchange is a second service. How would you react if a buyer paid for your item and then said "I already paid you, why do I have to pay for shipping as well".

"What else could I do? I had no trade so I became a peddler" - Lazarus Greenberg 1915
- answering Trolls is voluntary, my policy is not to participate.