I agree with Jon that loan modification companies are scams. A short sale is a different beast, and should be looked at as such.
An example of a modification company "scam":
Customer authorized me to speak with a lawyer who was going to do the loan mod for him. I called him every day for a month without him getting back to me or forwarding me any paperwork. The mod was pushed to another month causing additional legal fees, delinquent interest, and late charges to acrue on the account. I finally get the financials, but the lawyer will not return my calls or answer emails with questions that were pertinent to getting the deal done. I simply put together the best deal I could based on the hardship and the financials. I proposed to my management to reduce the interest rate to 4.5% (commercial loan). Management deemed that there was too much equity in the property (48% LTV) and said that the best we could do is 6.5% or we will foreclose on the property.
I relayed this information to the lawyer, who for the first time in this process called me back. He told me that unless I can do better, his client is going to tie the property up in bankruptcy for as long as possible and not pay me. I told him that was fine. He hung up the phone on me.
2 minutes later, the customer called me and told me that he does want to keep the property and does not want to go into bankruptcy. I told him that if he would work with me, and I could substantiate a lower interest rate, I would be happy to try. No guarantees, but I would try to get an approval. He said he would appreciate that.
I am working directly with the customer now. The lawyer called me yesterday and asked if I had completed a modification. I told him to speak with his client. He asked me why, stating that I had authorization to speak with him. I told him that since he misrepresented his client to me, I did not feel comfortable speaking with him any further about the customer's loan, unless I received further authorization from the customer to do so.
He got mad and hung up the phone on me. All he wanted was to get paid. Never had the customer's best interest in mind.