it depends on the type of traffic, not the ratio. i just base things on final profit, so i dont look at ratios much.

How can you not look at ratios & per click totals?

Let's say you sent Program1 5000 from your Free Sites & got 10 sales at $30 each for a total of $300. That's 1:500 & 6 cents a click.

Now let's say you sent Program2 2500 hits from a different batch of Free Sites & got 8 sales at $30 each for a total of $240. That's 1:313 & almost 10 cents a click.

You wouldn't look at that & think that maybe Program2 would be the better one to promote the next time you built Free Sites?

Or you can use Revstats and let it do the EPC for you, as math is too much for my peanut sized brain.