Whole network must upgrade. So spammer spend $1200 but bitcoin network 10x more on upgrade,
You must have quoted my post before I updated it with the new table to estimate the cost to the network that you were referring. I think "10x more" is an overstatement. It still looks like it costs the spammer more than the network as a whole [blue column] if we write the spam to the blockchain, even though I think the relevant cost is the cost per node:
Spammer only spends money 1x during lifetime, but miner has to keep bigger disk-space forever (2 hard disc consume more electricity than single one)