You just can't send out a batch of mailers one time to a list and expect to get deals.

But if you've won and haven't paid and don't within 24 hours, they just offer it to the next lowest bidder.You also can't bid on 50 thinking I'll just pay for the best 2 because "A deposit of 10% of your expected bids must be made prior to the close of any batch in which you intend to submit bids."

We've sent out our first batch of yellow letters just a few weeks ago.

The other agents want to work with agents they trust, so when there's 10 offers who your agent is can be critical to you ending up in the final batch.

Also since you have started yet, here's a proptip that is helpful:Pro-tip: Use 1 batch of postcards with first class mail then and then switch to yellow letters.

It was a small batch of 200 letters and I received over 20 responses.

Legal probably wont run you 4x what it normally does as I'm assuming its all batched into the same purchase from same seller will probably be more extensive than 1 deal....While its hard to know exactly what your costs would be, on your scale, i would probably venture closer to 50k than 5k but wouldn't think quite that much. 

I know there is a mixed opinion in BP about what marketing pieces work better,  letters or post cards.I'm about to send my second batch of letters/postcards.

One LLC for each property, or just batch them into groups of properties by area/town/street.

I'm not super responsive when clients start asking me or their agent more than one batch of questions about the property... by the time client is on their 3rd or 5th batch of questions, whoops, someone else already got the property.