> you end up paying more money for "open source" ERP than normal ERP

That's not what I see on the market. Even the paying version of Odoo is way more affordable than traditional ERP:

- licenses are 5x lower than competition: https://www.odoo.com/pricing (avg 25€/user/month vs 180€ for Netsuite - Odoo has a "no-extra" / transparent pricing policy)

- On implementation service fees, Odoo is usually from 30% to 75% cheaper: more capabilities and easier to implement or customize.

As a result of capabilities + affordable, Odoo became the most used ERP in the world: 16m users (incl free ones), 200k+ clients. (Netsuite is 43k clients, Dynamics BC is 40k clients)

Disclaimer: I am the founder of Odoo.