Yeah the bump thing is a weird one but @AndreBoulay definitely convinced me… it makes sense for people to have to come to the site and actively bump their topics to indicate they are still around, paying attention, and interested in selling their stuff… as @vegabomb noted you can edit the last post (assuming you posted the last post) to bump a topic as well. And I’ll admit I am kinda OCD like Vega, if I see a bunch of old "bump"s I will delete them to clean up the topic. 
Heck in the initial migration we added a step to delete all old posts that consisted of nothing but “bump”. So I guess the only thing missing from that mechanic is some kind of auto-cleanup.
Here’s a fun search trick I use a lot: when searching, add the letter l, by itself, to indicate you want to see the most recent results first.
Compare searching for
dunkvs.
dunk l
You can do the same thing via the “sort by” drop down on the search page (see below) but this makes it one step. I frequently want to see the most recent conversations about {x} so I reach for this shortcut almost every day!
p.s. It’s not a protip per se but definitely make sure you know all the stuff in the Tips and Tricks blog post! 
p.p.s. happy holidays ya filthy animals!