I've always been told its technically illegal to lie about the contents of the package and value, although many people do it anyways. If you lie about the value and something happens you won't get back the real value even if it was insured. Its much better to just be honest.
And never let people try to guilt or trick you into paying their fees. That is completely their own responsibility and I've been told its actually illegal for sellers to pay it. Don't let buyers guilt you into paying this. Most people who buy online in countries with such taxes know about them already and already expect to pay them. And if they didn't know its still their responsibility.
No one is accusing you of trying to make Tak cover the fees but unfortunately its not all that rare for some buyers to try and force/beg/guilt/etc sellers to pay customs fees for them. That's why people mentioned it.