I purchased the option to have a “pro” put it together for me.  They indeed sent someone that did an amazing job!  When I purchased this service, it was a one time fee for said product.  However, when the “pro” showed up, he didn’t know it was this large of a job.. he said he only had two hours, yet he worked 4 hours.  He asked me for money to compensate because he could not get I. Touch with Wayfairs third party vendor that hired him.. Handy.  I tried to reach them for him… the only was was through a “live chat”.  I informed them that he was unaware of his job and it took him double the time they paid him.  They, “Handy”, assured me that the ‘pro’ would be compensated for his time.  We shall see.    
I believe they are taking advantage of people.. period!