My guess is that if you diet is otherwise okay, then this would not represent a problem.  Of course, you can eat something with it that is rich in antioxidants, such as berries.

From what I've seen, these oils are not cheap, and I have never tried them.  From what I understand, they are rather tasteless in more refined forms.  You will find then in baked goods, for example.  Since butter is so inexpensive compared to these oils, you might want to just keep using it.  I recently made a corn bread with a banana and fat free milk to moisten the dry mix, along with very small amounts of coconut oil, and it was very good.  I ate it with butter, so that I didn't have to bake it with butter, and I like it better than way anyway.

I bought some 16 ounce containers from iherb.com at a very low price, less than $5 I think, and they might have a first time discount - you can do an internet search to see.  I use very small amounts, so it's not an issue for me.  Instead I eat a lot more shredded coconut, which I get for just over $1 a pound, and then I put it through a burr coffee grinder to make it into a powder, which can be used for all kinds of things.  With a little fruit juice and/or mashed banana, you can pat it down with a spoon and make a bottom for a torte type of thing.