I will adjust prices if and when they change 10% or more from the base price over a period of 3 days (to prevent variance/pump and dump).
What is "variance/pump and dump"? I know that "pump and dump" is a scheme where someone spreads rumors about a stock to get the price to go up, and then sells, but what do you mean by variance/pump and dump?
The price of LTC can vary from day to day by 2-5% typically. At times major people on BTC-E will spread FUD (Fear, Uncertainty, Doubt), or buy/sell huge amounts of coins to manipulate the price.
For example, lets say I had $50,000 USD, and/or a lot of LTC. I could buy up a huge amount of LTC, raising the price to a very high level. With the cash, I could then (also) establish a buy wall, which means that people can't purchase unless they go above that, which usually drives/keeps the price high. In such a situation, the user can remove that wall at any time, and easily bring down the price to a crash level. In some cases, it may only be 5-10%, but if you can make even 5% in a day, you'd be filthy rich in a month or so.
There are singular people on BTC-E that own $500,000+ USD of LTC. They can easily do what they wish at times to alter the price to whatever goals they want.
So my recourse with bonds is to average the price over a certain amount of time. For example, 2 days ago, the price crashed to $2.5 USD. I could have listed the 0.5 KHs offering for 0.4 LTC (which is $1 USD based on $2.50 per LTC). Instead, I've kept nearly every share @ 0.3, no matter what the market price is at. I will try to keep it at 0.3 LTC/share until the market goes past $3.50 LTC and stays there for 3 days, or drops below $3.00 for 3 days.
That way, you don't have to worry about small market changes and what you get out of what you buy... I believe its more transparent that way.