This is nothing new. Companies use psychological price tags to draw consumers to their offers. But the buyer realises that there are add-on items to purchase for a fully functional product/service.
That’s a common experience for those purchasing airline tickets. They see a discounted air ticket that looked like a good deal, only to realise eg. It is a one way ticket, does not come with check in baggage, etc…and after adding the necessary items, end up paying more than the original listed price before discount. But since they have made effort for to check out the offer or have already been psychologically sold to the product due to the discounted price tag, they simply buy it at a higher price.
Check out this article to see how companies play this game and let this awareness protect you from being the next “victim”….