I manage the following websites for almost a year now:
-alg-wiki.com (Azur Lane Ship Database)
-sd.alg-wiki.com (Azur Lane SD Viewer)
-l2d.alg-wiki.com (Azur Lane L2D Viewer)
-magireco.nuke.moe (Magireco L2D Viewer)
-arknights.nuke.moe (Arknights SD Viewer)
Basically these websites all in all costs around $5-$7 Dollars a month to run.
It started as a project with /alg/, then I picked up magireco and made one for /PMMM/.