Traveling between Venice - Salerno - Rome in early October. Taking some tours. Is it worth the money it to get the Italiapass?
Are you referring to the Trenitalia Pass?
https://www.trenitalia.com/en/offers/trenitalia-pass.html
If you mean this one, it is part of a travel agency. I don't have the time or desire to delve into its benefits.
https://italiapass.com/
Have you priced out tickets on the official Trenitalia site?
It looks like you’d need just 2 fast train tickets-Venice to Salerno then Salerno to Rome
If you are set on your dates you can probably purchase in advance for some nice discounts