It's hard to say because it really would determine the value of those #1 ranking terms.
if that site ranks #1 for "party poker bonus code" It will have much higher value than a site that ranks #1 for "pokerstars withdrawal time"
If the key words are of value that will lead to sign ups and
conversions than there is hardley a price to puqt on it without knowing traffic.
I sold a site that was #1 for "Bodog Poker review" I would get close to 15 RMP CPA's a month and was happy with that. now the new owners took 2 weeks to get signed up with bodog and there CPA is lower so they just lost a few thousand a month in revenue. It really depends if the terms are good for
conversions and there is enough traffic for those terms.