Inventive spelling is when the children spell the words as they sound so that they can express their thoughts rather than concentrating on the formal spellings of words. This is great to get children interested and started writing while also trying to teach them correct spelling as they progress in their own writing abilities. Some people feel that children that are allowed and encouraged to use inventive spelling don't learn how to spell correctly. From what I've seen and heard, this is not true. It gives the children confidence in their writing abilities before making them concentrate on their spelling.
Children have a natural desire to learn.
I feel they will want to learn to spell correctly if given the time and encouraged.