Hi Colby-
I think there will always be people who will try to take advantage of someone if they have the chance. Not just in this hobby, but in life. It sucks, but there's ways to avoid it. Some people will risk their reputation over a couple of bucks-it's pathetic but true.
I've never been burned on Net54, and have made some great contacts and usually try to stay buying from people I've had good dealings with. It's always good to have a few raw cards of whatever you collect so you can really get to know them-you will see that it makes it easier after awhile to notice something that "doesn't look right".
And finally, there's many people on this board who are willing to help if you have questions before you pull the trigger on something- don't be afraid to ask for help. Many decent board members with a ton of knowledge who will help a fellow collector. If I can ever help, feel free to contact me (I'm no expert, but if I don't know the answer I may be able to point you in the right direction).
Don't let scam artists discourage you from enjoying the hobby. They usually get outed and squashed like bugs.
Sincerely, Clayton