Why is it a problem?
Personally, I tend to get attracted to more rare things. It's because things lose beauty to me when I "get used to it", which happens rather fast when something is frequently used. It happens to mounts, it happens to babynames. It even happens to the colour on peoples walls. I've chosen a completely different colour than 90% of the people I know, because I am simply fed up with the colour I see everywhere else.
That said, my favourite mount isn't that rare(Swift Zulian Tiger), but I kinda like any mount at this point. People use so many different ones, that I don't get a chance to get fed up with it.