In most cases, the domestic US and Canadian CLs I have visited have alcohol prices close to or slightly above the lobby bar. I think drink pricing is left up to the individual hotels who have to take two things into consideration:

1. Its an honor bar. Most guests are honest and fill out the chit for their drinks, but we have all seen instances where a guest comes into a lounge fills a glass with their alcohol of choice and doesn't fill out the chit.
2. Most of the alcohol in the CL (with the exception of beer) is self pour. Meaning you can take as little or as much as you want. Even in cases where the CL attendant is pouring the drinks, they are usually quite generous. Take a the glass of wine for example. At the honor bar, you are free to fill the glass to the top. Downstairs its a 3oz - 5oz pour.

So I am sure its quite a chore to figure out drink pricing taking the above into consideration

Regards,

RIP...