Stock going up should be no reason not to average up.
IMHO - In most cases, averaging up is more beneficial in long term rather than averaging down.
Typically one should buy a good business over a period of time - say 5 years. And hold another 5 years for the full cycle to play.
In these five years - you will get ample opportunities to see the management ethics, the business prospects and other factors which may increase/decrease your conviction.
When you are convinced that you are holding a good business with sustainable growth - you should NEVER hesitate to buy it upwards if it has gone up 2-3-5-10 times up.
Even if your average price is increased 2-3-5 times, staying with a winning stock will pay tremendously in longer term with a decent dose of capital.
And similarly you should not hesitate to sell your business if you feel fundamentally something has dented the future prospects. Even if price is lower. Selling your looser timely is one thing which only experience can teach.
)- Som