Thats going to happen when sellers provide NO discription of condition and post 1 crappy picture. I'm sorry to say that 99% of the adds are like this. I buy guitars and most sellers don't even put what brand it is and just say "normal condition",WTF!. I thought Craigslist was bad but Offerup is 10x worse. I'll stick to garage sales Thank you
Welcome to the Community Forums @tbird. The forums have tons of info, advice and current conversations to engage in. I hope you'll continue to stay active.
Unfortunately, it is difficult to get folks to post good descriptions and pics. However, that's not the reason for lowballers. Not even close. It's mostly about reselling your items for their profit. While there are a few who very make low offers, might be looking at your item because they have a true interest; that's the minority in my opinion.
I've sold several guitars, basses, amps and effects. You really aren't going to see great descriptions much of anywhere other than dedicated guitar or music platforms. You don't even get a decent pictures, as you stated, much less info about neck, frets, electronics or age/year. Stay active, lots of other topics.
Unless it's on the way or convenient for you, don't offer delivery. You will lose any/all leverage. For insance, what happens if the buyer decides not to buy it after you have spent time and fuel to deliver it? Be careful of those that offer gas money, as it is ony relevant if they decide to buy it.
Personally, it does not matter if the person is even only 1 mile away and willing to buy an item that is $500 or $5000. If someone wants to buy it, they will make the effort.