You guys do realize if you have a USB then you can do it yourselves.
On the subject of Gamerscore modding if you do not mind it being reset then go ahead. It does not matter how 'stealthy' you are you can, and more than likely will, be reset.
Also, charging $5 for 10k+ Gamerscore is actually ridiculous.
Yes i can still do this, and i only charge 5 dollars for more then 10k cause its takes a while to even mod I have to mod one by one achievement, At a time with this program i have there for i charge.