Value / effort exercice... how to "define" the Value or Impact ?

i am currently working on a session where we will use the Value/ effort exercice for each key idea.

Regarding the effort, we will use the T-shirt sizing with a reference point like XL: 1year L:6 months etc... but i am struggling a bit regarding the "VALUE" what kind of reference point you can have for value ... because value can be in so many different ways ? any suggestions from the club ;)

i would like to have a similar approach than XL : 1year , etc... but for the value / impact.

thanks

All ideas more than welcome.

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