More nodes will not give more ingress, instead it will be distributed between them, so each node will get only part of the common ingress. So 2 nodes x1TB or one node x2TB will get the same amount of ingress.
Running multiple nodes makes sense only if they running on own drives, not sharing the same (which is violation of ToS), this way you increases durability - if the one node die, you will still have a second one, losing only half of the common data, not all as in case of only one node.
Of course, if you have RAID already for something else, it’s OK to run a node on this RAID, otherwise it’s better to run a node per drive.
See also RAID vs No RAID choice and RAID0 vs. RAID1 vs. NORAID for 2x 1TB Drives?.