I think if you go with someone who has been a member for a while,  has had lots of transactions and lots of forum posts you're pretty safe.

I occassionally sell credits.  I have some available now if you are interested.,

    I still have credits available.    $2.50 each  (minimum 10)    $2.60 less than 10

PayPal "gift" please.     Fast service, satisfied members

I've never had an issue selling or buying, but Adrienne's advice is good - an active member makes it much more likely you'll have a positive experience.

Jamie,

  I sell credits every month,  I always transfer as soon as the money goes into my pay pal. I have some members who pm me to see if I have extra credits.  

I too sell credits, and have had no problems.  Good luck  Pat

I always look for someone I know from the forums.

Jamie,

You;ve already had good advice - pick a long term member, with lots of completed transactions,  who is active in the forums, and you should be fine.

If it helps, I can't recall any posts about problem "credit purchase" transactions, except when it should have been obvious that the seller was suspicious (I think they were selling for $1 on that occasion, with only one forum post).,

You've probably already been hit by PM's from members trying to sell credits LOL. if you're still looking, check my signature line :-)

I would also mention that there are those who aren't active on PBS, but very active at SwapaCD or SwapaDVD, who may also come here to sell credits.  I bought some recently from somebody who is very active at one of the sister sites. 

I think the bottom line is you choose someone you who feel you would be comfortable with buying from.  As cliche as it sounds, if you trust your gut in these things you usually can tell when a deal smells bad. 

Yes, and also note that there is a 50 credit per month transfer limit for members, so anyone offering more than 50 credits will not be able to fulfill their end of the deal...  (The only "problem credit selling" scenario I can remember is a member who was offering 100 credits for sale at a really low price.  Since the site only allows transfer of up to 50 credits per member, this was an obvious problem that was shut down.)

Yep, everything they said.