Customs charges, duty, taxes and fees for importing and exporting

My policies state that I do not forge documents and I refuse to do so. I don't have it written in huge font clearly across my listings, but it is there if one chooses to read all the fine print.
I mulled over placement and wording of this policy for quite a bit and still don't know if my way is the right way but here is my logic. I figure that paying the taxes, duty or whatever other fees that your government accesses is the 'right thing to do'. As much as I feel that governments (in general) over-spend, having income is a necessity in order to keep the country running. So, fees and taxes that are accessed at the borders are just a part of that system. Just like our state taxes, federal taxes and sales taxes, of course we would like to keep them to a minimum but we can't avoid them.
I feel that it is actually rude for someone to ask me to lie for them. It would be rude in other instances so why is it acceptable when it comes to shipping out of (or into) the country?
I feel that filling out the papers honestly is what I am SUPPOSED to do and that stating that I will do exactly what I am supposed to do is unnecessary. This is why I have only stated it briefly and in the fine print.
I am SUPPOSED to send them their item, but I don't feel that it is necessary for me to state "I will send you this item" in my listings.
Things always look a little different when taken out of context.
Like the request I got once asking me to still state that they paid XX amount but to manipulate it to state that they paid only $29.99 for the item and the rest was shipping costs. If I went to sears and purchased a new refrigerator, what do you think the clerk would say if I asked could my fridge be rung up for $99.00 and the rest be rung up as a delivery fee in order to only pay sales tax on the first $99?
I also understand that sometimes the fees are quite hefty so I am sympathetic, but just not wiling to risk my business.
What are your thoughts?