I don’t closely track the percentage of domain extensions in my portfolio. I could have 75% .com or I could have 99% .com domain names in my portfolio, and the only implication is higher (in general) renewal costs. Because I buy more domain names that I sell, my portfolio has been growing each year, so tracking the increase in renewal costs isn’t really helpful in seeing how the percentage of .com domain names is changing.
I’ve primarily invested in .com domain names since I started my business 20 years ago. I think great one and two word .com domain names are the most desirable assets for businesses around the world, and I have always wanted to invest in domain names like these that sell themselves.