If your numbers are correct, now do the math for price. lol is the hugly added cost for the 0/1 beneficial to gain a whole 25 sq mm?? ummm NOPE!
However, depending on the brand 0/1 wire the poster would be using would make a huge difference since some brand wires like stinger tsunami has less wire/more casing compared to something like Knukonceptz fleks, Kicker hyperflex, RF wiring, or XS Power wiring (which are considered over sized 0/1, but still sell for the same price per foot retail)
and see if the extra few hundred for 10 runs of tinned ofc 0/1 is worth it VS a 3/0 welding cable that is pure ofc copper with no tinning.
Unless you have 1500 amps( five 300amp alternators, assuming you use 5 runs for positive and 5 runs for negative) worth of alternators under your hood. 10 runs of 0/1 wire is not practical when you will never be able to use the wire anywhere near its full potential amperage load, while spending more money for more wire, and having to run all the extra wire..
So again assuming 10 runs of 0/1 are being used as 5 runs of positive, and 5 runs of negative equaling 10 total runs (at least Id hope that is the way he is thinking, otherwise making it even more wasteful to not upgrade the grounding).
5 runs of 0/1 wire is capable of 300 amps of current (maybe a bit more depending on brand wire).
5 X 300 = 1500 + amps of current on the high side and again, the other 5 runs being used for negative.
3 runs of 3/0 wire is capable of well over 500 amps (closer to 600 amps of current), but we will lose the low side being 500amps per run of 3/0 just to give the 5 runs of 0/1 a fighting chance..
3 X 500 = 1500+ amps of current on the extremely underrated side, 1800+ amps of current on the high side.
Also the cost of the wire will most likely be a lot cheaper because it is not branded car audio wire and have a huge inflation price due to the brand name. It will be quicker to install due to having less runs, and less of a inconvenience trying to find room for 10 full runs (if it its ran underneath).
As I said way above, the brand of the 0/1 wire your thinking about plays a huge role.
EDIT: Now if you are driving a Honda CRX and its a burp only car for Street A or B, then your best off getting as many equal length runs of wire as possible since your are limited to 1 800 cubic inch battery underneath the hood, and the car must not be running when you are competing in the lanes. but otherwise I dont see the benefits of 10 runs at all, unless your giving the wire for free.