It practically 1:1 at the moment (1.00 USD = 0.999026 CHF)

How do you think the rest of us feel? Sure you get a feel for roughly how much a dollar is but I also don't have a currency converter in my head, just in my browser.

Maybe an extension that converted things that look like currency into a grokkable currency of your choice?

If you are looking at their website using a browser connected to the internet, you don't need to do currency conversions in you head and memorise the exchange rates every morning, you can just use that same browser to ask for a currency conversion from any of a number of sites, e.g.

https://www.google.co.uk/webhp?#q=1%20chf%20in%20usd

https://duckduckgo.com/?q=1chf+in+usd&ia=currency

http://www.wolframalpha.com/input/?i=1+chf+in+usd

If they are charging in CHF, then it's in both their and their customers' interests to quote in CHF, otherwise fluctuations in currency markets and variations in the exchange rates offered by their customers' banks will invalidate those quotes.

That's all very true but not the point. If you want to sell your product, you should make it as easy as possible for the customer to understand the value of your product and price is part of that judgement. And charging in CHF is not an excuse not to put the price in USD or EUR next to the CHF with the most up-to-date conversion rate that you get from those links you shared.

You do have a point, but it still would be more convenient if the website showed the price in USD\other currencies as well.

The problem is that exchange rates vary. Showing the current rate would be misleading.