Still there are other pro's which need really a Powerful Workstation ... Photo/video are not only pro ..
there are digital content creation (3D modeling / animation / simulation / VFX) plus many more.. who need proper workstation not a toy. with Multipule CPU's GPU & hell lot of ram..
i7 ahahhaha its a gaming processor .. Xeon is real deal when 3d rendering ( not processing / encoding photo /video)
An i7-3770K easily matches your Mac Pro.
Are you planning on getting rid of your toy and getting a real computer anytime soon?