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?

Silly plan to avoid international duty and taxes ... didn't work

I try not to write about my buyers and their specifics because I feel that people deserve a right to privacy but this one is just too much NOT to share. I'll make sure that I don't write anything expressly identifiable.
A few weeks back I get a question from a potential buyer on ebay who lives in Europe asking me would I be willing to mark the item as a gift. I take my business seriously and really don't need the trouble, so my policy is to always fill out forms honestly and I stated this to the potential buyer. (I'll include my thoughts on this subject in another post....I could go on and on)
so anyway, buyer responds back asking me to mark that he paid less for the item and more for shipping to equal the same total. I responded again that I fill out the paperwork honestly.
The next email was asking me if I would be willing to sell him the shirt for $29.99 and the buttons for $29.99. After a couple of emails back and forth to clarify, I finally agreed. He sent me a best offer for the shirt minus the buttons and even paid with two seperate paypal transactions.
I think it is completely ridiculous, but yes, I cut the buttons off of a brand new shirt and sold them to him for $29.99 and then sold him a shirt, button-less, for $29.99.
He paid for shipping separately too, and I sent them out separately with invoices for what was inside.
The shipping he paid extra in order to do this was $12.50. I don't know what the duty and taxes and all that are, but I just can't imagine them being more than $12.50 for a $60 shirt. Plus the extra trouble of having to sew the buttons back on too. And, the risk of one of the packages getting lost.
I expressly told him that he would be nullifying our return policy because the shirt would be considered 'altered' when I took the buttons off. He agreed and also agreed that this was completely his gamble.
End result?
Customs is holding the button-less shirt! The buttons, which were sent via USPS first class international have arrived but the button-less shirt, which was sent via USPS Priority (also his instructions to send by two different methods) is held up at customs.
This just makes me chuckle.