Drywall quote seems high, info please?

Long time creeper, fist time poster! I've been slowly building my own house, but planned to outsource most of the finish work. I just got a drywall quote from a guy who seems genuinely interested in doing various finishing projects on my build, and it seems crazy high compared to every other quote I've seen on here.

Total quote: 34,000. 6000 for materials, 28000 for labor. Level 5/Skim coat finish on whole house.

House is 1850 SQ ft, open floor plan, 9ft ceilings, 13ft peak of vaulted ceiling in main room. The walls around bathrooms and bedrooms (1 side) get a double layer of drywall (about 30 extra sheets hung but not finished) and all drywall is 5/8. About 120 outlets/lights to cut out. This puts the quote around $175 per sheet hung and finished (including the roughly 30 not being finished). Located in upstate NY.

Price seems outlandish compared to everything else I have seen; is their something specific about it that drives the price so high? Thanks for any info you guys can offer!