Shaiya won't die as long as there are players willing to spend 20K AP per month minimum no question asked.
I say minimum based on EoM only. I am sure these players spend even more weekly for 'mini-tiers' at 15K AP.
Tier just reached 20K for full benefit. 6K more for 'bonus'. But compared to last month 15K repeatable with 30K giving the top attraction, it is a discount.
Notice no $$$ is used because I am sure half the AP 'spenders' don't use $$$. Apparently Shaiya servers can be run on OPs.