Is it possible to sue if?

[Brandon I Garcia]

More recently I had a great deal... it would've been my first. Had it all under contract and was only waiting on the appraiser report from someone that was through the lender (should have been a independent person). This appraiser goes MIA for a week (the weekend we were supposed to close and contract was up) wasn't answering phone calls, texts, emails, etc. Few days later, seller says he isn't extending and that the price is increasing (30K higher). Yeah I messed up on that deal... I was slow to give documentation and just always thought "he'd extend". Unfortunately he didn't but something was very fishy about the situation. I'm lead to believe the seller and that appraiser should've had no contract with regards to what it ended up appraising at... if I suspect something was up? Should I get a lawyer involved? Think it's worth to purse?