When people say to me that they can buy an item on eBay for $x and will you match. My response to them is - 'so buy it on eBay' - wait for your card, hope it doesn't get caught up in customs, and hope it is in the condition you want or buy it from me at my price and you can go home with the card you want in hand.
During the last six months with no shows - online sales has been great - higher than a combination of shows and online before Covid-19. It is wonderful waking up in the morning and seeing what has sold over night.
As a business - setting prices always takes into account the cost of doing business. Flexibility is always a possibility - especially when multiple items are being purchased.
As for shipping charges - mine have been set at the same for the past four years - and I have found that it has never hurt my online sales. They are set based on total cost - bubble mailer; supplies; postage and time to go to the post office on a daily basis, as I mail within 24 hours of receipt of payment.
Never have used Ebay global shipping, as it is a total rip-off. I do find that most will take shipping costs into account when they purchase or make offers - but have never considered raising shipping cost to offset selling costs.