I have been pondering this question for some time now and had a thought. This sort of goes along with upgrading a row of walls versus one piece at a time...
What if they kept the wall prices the same, however, if you are upgrading long row, they discount subsequent pieces within the row.
Something like, you pay for 5 pieces at regular price and then the remaining gets something from 10-25% discount... Of course SC could keep it on the low end of 10% and make this discount for wall upgrades at lvl 8 or above. Maybe level 10 and above... I see a lot of complaints on those levels...



