this would be a lot more convenient for threads like 'is this a fair trade' where it can be difficult to find out if someone has replied to you or not. especially near dec 18th for threads like
these where there are crazy amounts of posts you have to scroll through to find out if you got a response or not. sure, you could ask to be PMED, but people won't always see that and / or conform. it'd be a lot easier to just be able to say @(person's username) here's what your pet is worth. quick and easy rather than the pages and pages you have to look through, oftentimes to find out you didn't even get a reply.
payments for art / payments for coding, someone forgets ? quick way to remind them. it would definitely be saving time and i cant really see any downsides to this idea in the first place.
sorry for the long message, 100% supporting ( :