A Pro deducts these purchases as professional expenses.
...A pro still has to justify those expenses to their employer or clients. A pro still needs to raise the cash or credit to actually buy them. "Tax deductible" is not the same as "free". Even a "true pro" will need a good justification to shell out for a Mac Pro system.
This is the kind of bone crushing power needed in studios (music, film, graphics, animation).
...except, if you do have that "because Pro" blank check, you can already get
dual-Xeon PCs with twice the number of cores, NVIDIA GPUs that are better-supported by pro video/3D software - not to mention specialist systems for GPU-based computing that can take
10 GPU cards. Most of the new tech shown of at WWDC was Intel and AMD stuff that will be coming to a cheap(er) beige box near you by the time the MP is actually in the shops. Thunderbolt? Its a narrow pro-sumer, non-networked niche between USB 3.1g2 on one side and 100Gbps Ethernet, Fibrechannel (goes up to 128Gbps these days) etc. on the other (oh, and with a compatible motherboard, Thunderbolt is a $100 add-in card, anyhow).
So, sorry, no, if you're on a Hollywood studio budget and need 'bone crushing power' the Mac Pro may be small beer price-wise, but its even smaller beer spec-wise. The only model we know the price of is a $6000 "prosumer" machine with the spec of at $3000-$4000 PC.
Now, Logic Pro on the other hand is excellent value for money c.f. competitors like Ableton (if you look at the artificial limits and minimal instruments on anything less that the full-price suites) - but then you've partly paid for the extras when you bought your Mac...