How does Guaranteed Offer in 48 hours work?

[Hussain Hashim]

I see on investor websites and other types of marketing campaigns where they are guaranteeing an offer within 24 or 48 hours. How are they doing that? Do they just throw a number out at the seller and then negotiate once the meeting is set? Does anyone have any experience with this or have heard how this strategy works? 

You help will be much appreciated!