Appraisal for MLS Property

[Garreton Smith]

Hello BP Fam, 

I've been putting in offers all week for flip deals. One seller wants me to get an appraisal done (out of my pocket) to go with my offer. The house is extremely distressed and needs a lot of work done. I called an appraiser and he said he won't be able to pull comps on a distressed property the most he can do in his report is assume an ARV and minus it from what he thinks construction will be. Should I take this gamble? What are your thoughts?