really depends on the area you are farming, rift spawns, invasions, population and server wise. you cant say for sure so your question has no correct answer and what is a "good" lvl 50?
I'd say about 12-15 Plat. This requires auctioning materials & items you you've acquired. Just plain selling everything to the store would only get you about 6-8 Plat an hour. Ofc I auction most of the stuff that's in demand in the AH.
Again, really depends on the area you are farming and what the mobs drop etc, depending on your server aswell. but its average around 5-15 plat per hour if your farming in level 50 areas, one good tip is to make your own profile away from other botters. Alot of bots run around in Shimmersand(South Telara) botting all day aswell as the Khaer Kholum cloth profile that Hawker released. So watch out
I run the ele/chlor/archon spec with 1200 sp and a hone made crown hill profile. I manage 10-15 p an hour. I vendor alot, the cloth and greens get runebroken and mats sold in bulk
Here's a Tip: Don't Auction items from your botting toon. I always use an alt to auction. If you use your botting toon to auction some curious/jealous players will add you to their friends list & then go look for you & report you. It's better to be safe than sorry IMO.