So would it be safe to say that…

LISA Values are: ??

LISA I - $20K to 25K ??

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The most recent listing for a Lisa I on eBay failed to sell, auction started at $16,000.

LISA II - $5k to 10K ??

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Good luck. A 2/5 in working condition with 2 Profile drives and the original box went for $2,300 in March.

http://www.ebay.com/itm/RARE-Vintage-Mint-Condition-Apple-Lisa-2-Computer-2-5mb-ProFile-HDs-WORKS-in-BOX-/261177055874

A slightly gimpy (keyboard acting up) 2/10 went for $1,075:

http://www.ebay.com/itm/Working-Vintage-Apple-Lisa-Computer-/200907631370

LISA XL - ??

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$885?

http://www.ebay.com/itm/Vintage-Rare-Apple-Lisa-Macintosh-XL-Computer-Powers-On-/160973122199

its nice to have an idea that something you have could be worth multiple thousands of dollars

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Yeah, it's a nice idea. Probably not true in this case, however.