Kelly,

It's actually an odd question. I agree with some of the answers if it applies to one home in particular, but if they are doing it to multiple homes, then it's a bit odd.

My only guess (assuming that the person is competent) is that they are making multiple offers to see if the seller's motivations change. For example, negotiate the price down to $150K - then think, "I should have asked for $140K" then come back and ask for $140K. It's a bit of a danger with the due diligence, but my hope is that sellers aren't that desparate.

OR

it's just incompetence.

This comes dowwn to unprofessional agents. 1. They can't afford to chauffeur unqualified suspects around wwithout proof the buyer can buy. 2. They should not watse a sellers time. This comes down to desperation and a fact that most buyers and sellers think they are doing the agent a favour, the agent is weak because the do not prospect and have very many potential clients hence the scenario.
A top agent saves their buyer time and money. A top agent negotiates and is a catalyst for the transaction working hand in hand with the co-op to get the contract to the table. Ready, Willing,able period.

Kelly,
I agree with Diane about the pre-approval letters and I always include them as well as should ALL REALTORS. I wish you the best

Kelly,

Honestly, I do not know.

It almost sounds like she/he has a client that is maybe just looking for a good deal so they keep writing contracts to see if someone accepts there offer.

As far as financing, I do not submit offers without a pre-approval letter and no other agent should be doing that either.

I wish I had a better answer for you.