I guess you have never dealt with end.
Customs is a crap shoot.
Some days the customs officers are on the their game and some days your package may go in front of an officer that drank too much the night before and is sending everything through without checking it.
Websites are not a definitive guides as to what will happen with your package. They are more of a perfect world se
I've only paid customs on one knit that was a little over $300 with shipping and it was around 45 from ups. I've dealt with ln-cc, wrong weather, farfetch, tres bien and ra-shop and I've never had to pay customs for items that I paid under $200. Maybe your right about customs only one I thought I might have trouble with was wrong weather but I emailed customer service before ordering that I've heard bad shit about them marking things wrong. And since then I've had nothing but good things from them. Out of every webshop they have the fastest shipping and processing orders. I think it helps emailing customer service prior to your order, it only takes a couple minutes and saves you for any future hassle.
I think about it this way I was a server in a restaurant and if a customer had a certain concern about their order prior to me putting it in. I can only imagine how much more of an annoyance they're gonna be if there's something wrong with their order after I serve them.
That's my advice if you're really concerned that your going to have to pay for customs fees because I seriously doubt that these companies process hundreds of orders a day.