Salespeople pull this crap with all kinds of things that don't really have any actual time-pressure on them, though. Home remodeling, various services, unremarkable (that is: not unique or highly in-demand) cars. In fact, "we're running a special that'll get you 10% off if you sign today" is usually a strong indicator that I can ask for 15-20% off tomorrow and get it. If that kind of salesperson offers you a "deal" unprompted, then that "deal" is actually their price for suckers. I hate that kind of thing, don't like being manipulated, and don't like it when scummy salespeople win. So I'll either look somewhere else or take that newfound knowledge and ask for something better than the "special", on my own timeline, not the salesperson's.
We eventually settled on a IKEA kitchen, just because they are fully transparent and offered what we needed, with no pressure or tricks. And I got the chance to build my own kitchen, which was a nice experience. If it was not for their limited choice of options they would be the only contender for our next kitchen.
I think that's good. They can't promise you any upcoming sale as they don't get to decide on that, but they know the sales generally come up on X day of the month/week.
Also, real estate is an exception because:
1 - there is actually scarcity. A building with 200 apartments only has 200 apartments.
2 - Some buildings are already (almost) full, so you can only get in when someone gets out.
But what I see here where I live are offers that are valid for a whole month or two. Of course, if all units are taken, then you can't get it, but if they have an unit available, the offer is good
It's like when you interview for a new job and ask you if you are interviewing with anyone else, why would you ever say no?
But yeah like moshmosh said, real estate is different. Anything where you are vying for exactly one of a thing is a different beast than whatever crap you SAAS vendor is trying to tell you.