I don't believe those creases look as bad on Cassie's chairs because the creases are kind of hidden, in a way, with the folding and tying of the fabric on the chairs. Those folding creases really stand out and look 10x's worse when it's spread out over a table don't you think?
I think the point of this whole thread is that a "neat" presentation should be Disney standard. Why else would they care about you using outside vendors for events visible to park guests? Wouldn't you agree then, that it's kind of silly that they are okay with putting out wrinkled/creased table linens? Aren't they kind of embarrassed? And why are they charging an arm and two legs to have them steamed? This isn't right.
Is it a deal breaker for me? No, I love Disney otherwise and I've dreamt of having my wedding with them. But, I do have to say, I'm very disappointed in some of the ways they choose to do things.