This sculpt was exceptional back in 2005 but there have been better sculpts since, I feel. A lot of this doll's appeal, in my opinion, is that there is so much "isn't she wonderful?" sentiment attached to her among many who collect Himmies. In other words, "status symbol". Don't misunderstand this. There are those who love this doll for the doll itself. But there are those who love the status. But this is true with anything whether it is a Louis Vuitton bag or a pair of Jimmy Chu shoes. There are those that buy the item because they love that item and then there are those that buy the "name".
Ilai has a sweet disposition, but a lot of dolls released since 2005 have this as well. For me, Toki, Lillemore, Kindra, Tetti, Margie, Milla etc. all have that endearing disposition and in recent years the sculpt has improved technically since the smile now reaches the eyes. What has always bothered me about Ilai is that the mouth is smiling but the eyes aren't. It's also what bothered me about another very popular doll in 2004 called "Linn". But people see different things. Ultimately, different dolls appeal to different people.
Personally, I like Ilai, but I don't love her enough to buy her at any price - high or low. There are other smilers I enjoy more.