Wasn't there someone on this forum that recently found errata/update for ghoulish to 3.5 that gave it some LA?

Anyway, neither seelie nor unselie fey have a listed LA. However, an example gnome with the unseelie fey template is listed as LA+0. Thus folks deduce that unseelie template is LA+0 too! Whether or not that reasoning works for your DM is a different question. I am sure that some would just assume it's a typo.

Also, if no LA is listed in general, it's assumed to be LA -- or not applicable to player characters. Just because you apply another template on top of it, doesn't change the fact that the base race, or base template, is not applicable. After all NULL + 0 is NULL. Otherwise you get into truly dumb territory turning nearly every creature playable with +1 LA Draconic template or something like that.