None of these devices replace basic security practice, they add a layer of visibility on top of it. For businesses evaluating where connected security hardware fits into an existing setup, see https://haderslevwiki.dk/index.php/Brugerdiskussion:Marquis42Z.
The honest answer to what a POS system costs is that it depends entirely on which pieces a business actually needs, and pricing pages that list a single number rarely tell the full story. Terminal hardware alone can range from an entry level unit built for a low volume counter to a flagship terminal with a faster processor built for a business running multiple transactions a minute during peak hours.
The practical change is in order flow, not just the format. A paper ticket sits in a fixed order on a rail, while a kitchen display system can group items by station, flag how long an order has been waiting, and update automatically the moment a server or counter staff member makes a change, without anyone walking a corrected ticket back to the kitchen.
A label printer does a very different job from a receipt printer, even though both use thermal technology. A receipt printer prints one long strip per transaction. A label printer prints individual labels, often for pricing, product identification, or shipping, and it needs to handle a completely different volume pattern across a working day.
Connection type decides whether the drawer actually opens when it should. Most retail cash drawers connect through the receipt printer using an RJ11 or RJ12 cable, which means the drawer needs to be compatible with whatever printer the store uses, not just the terminal. A mismatched connector is one of the most common reasons a new drawer sits unused in its box for a week before someone notices.
For most retail and food service businesses handling more than a small handful of product lines, the reporting and inventory tracking a POS system provides outweighs the simplicity of a traditional register. For a closer look at how the two compare on cost and capability, read https://haderslevwiki.dk/index.php/Brugerdiskussion:Marquis42Z.