Seller agrees to sell but ignores the contract

[Lukas Vanagaitis]

Owner says he owns the property free and clear. There are 2 other people on the title. Property is vacant (despite some homeless guys) and in a bad shape. We agreed on the price, numbers worked, I sent him standard 1 page agreement, and he hadn't called me for a week. Later we agreed to increase our offer (and reached MAO) in terms of getting signed contract within 72 hours. Another week passed by. He answers the phone acts like a busy person and apologizes, says he still wants to sell it to us and promises that he'll get it done tomorrow (same on every phone call). Is that some type of new scam? Would you still chase the deal?