Hello!

I just started (today) with buying domain names. I now found myself with many domain names, spent an estimated of 300 EUR on my first day.. It's to addictive haha.

Anyway, I just have a question about extension values. Obviously I know .com is worth most, however I am unsure about other domain names including .mobi.

What if a website with a .com extension was sold for several millions. How much would the .mobi extension with the same domain name be worth?
Also, when selling such a domain name, would you go to a website like flippa or sedo to sell it off?

Thank you very much for your help. I'm sure I will hang around here alot from now on.