If I were in your shoes I'd tiptoe around the fact that they wanted an item for 1/10 the price, and explain that no quest is worth a 10k item, you're better off rejecting it/waiting for the time to run out.
There's no use begging on a virtual site, IMO the whole point of it is to see how well you play, and if you get rich off that then it's something to be proud of. If you just want to see a big (useless) number with NP tacked on at the end, then code a page in Notepad to look just like Neo, and edit in 1,000,000 NP. Heck, change the URL for your pet's pics to Royal for all we care.