Buying Listed Property?

[Jessica Brown]

I'm new, so forgive me if this has a very obvious answer.

I've seen and been told to avoid property that is already listed under a realor...

I'm looking for flips under 75k, which dont often come up listed however ive found a few that seem within the range of what I'm looking for already listed with an agency.

Can someone explain the negative impact of buying a property like this just because its listed by a realtor?