>> I’m currently working on an in house ERP and inventory system for a specific kind of business

this means if I sell it to your business for the price of < your salary - you will get fired and business will use my version.

Why? because my will always be better as 10 people work on it vs you alone.

Internal versions will never be better or cheaper than saas (unless you are doing some tiny and very specific automation).

They can be better than current solution - but only a matter of time when someone makes a saas equal and better to what you do internally.

Sure almost anything will be better and cheaper that hubspot.

But with AI smaller CRMs that are hyper focused on businesses like yours will start popping up and eating its market.

Anything bigger than a toy project will always be cheaper/better to buy.