A flash game? You mean to kill some time?
Yes, the site's users would kill some time, you would display your ads banners, more active traffic (like these Flash games sites do).
If there were a little bonus in gold people would be more incentived to spend time this way (or achievements system, badges).
I see what you mean. Sounds like a good idea. If there is more traffic we could lower the upgrade costs and hence you guys would earn a bit more.