not really, the basic differences between tier 5 and tier 6 are a slightly larger avatar (by 10px) and a larger Profile pic, up to 200x300. other than that you get more 200 more pm space and unlimited album space.
so in all seriousness, it's probably not quite worth the donating the $100 to get it if all you want is the perks. But if you want to donate $100 than by all means, I'm sure Rukario would be thrilled.